Explanation:

Since the question states that JavaScript controllers CANNOT be used, the developer must rely on other APIs provided by Salesforce B2C Commerce Cloud for retrieving product data from a mobile device like an iPhone.

Let’s examine the options:

🔹 Option A: Use import/export in Business Manager
This is not suitable for real-time or selective product retrieval.
Import/export is meant for bulk operations, usually done offline or during deployment cycles.
It doesn't provide a dynamic interface for a mobile app to fetch specific product data.
🔴 Incorrect

🔹 Option B: Create a webservice to retrieve products
While this sounds like a viable approach, Salesforce B2C Commerce Cloud does not allow arbitrary custom webservices outside of JavaScript controllers, and the question specifically restricts their use.
Additionally, B2C Commerce is a hosted platform, so deploying a custom web service server-side is not natively supported unless you use the platform's exposed APIs.
🔴 Incorrect

🔹 Option C: Use OCAPI and invoke it in native language
Open Commerce API (OCAPI) is the correct solution here.
OCAPI has two major components:
Shop API (for storefront interactions)
Data API (for backend data manipulation)
From an iPhone app, the developer can use OCAPI Shop API endpoints to retrieve product details over HTTPS.
The API can be called using the iOS native language (like Swift), and responses are in JSON.
✅ Correct Answer

📚 Reference:
Salesforce B2C Commerce - OCAPI Shop API
Example: GET /s/-/dw/data/v21_3/products/{product_id}

🔹 Option D: Use WebDAV Client to retrieve products
WebDAV is used primarily for uploading/downloading code and static assets, such as cartridges or content assets.
It is not used to retrieve product data and is not suitable for real-time access from a mobile application.
🔴 Incorrect

🧠 Summary:
When a mobile client like an iPhone app needs to selectively retrieve product data and JavaScript controllers are not an option, the best solution is to use OCAPI, specifically the Shop API, and invoke it using the native language of the mobile platform.

Explanation:

In a task-oriented CommonJS job step, you control the exit status using the dw.system.Status class. This allows you to:

Indicate whether the step succeeded or failed

Provide a custom status code (like "NO_FILES_FOUND")

Optionally include a message

✅ Correct Implementation:

var Status = require('dw/system/Status');
return new Status(Status.OK, 'NO_FILES_FOUND');

This tells the job framework:

The step completed successfully (Status.OK)

The custom status code is "NO_FILES_FOUND" — which can be referenced in the steptypes.json file

❌ Why the other options are incorrect

A & B (object literal with success and Message) These are not valid return types for job steps. The framework expects a Status object.

C. this.status = 'NO_FILES_FOUND' this is not used for returning status in job steps.

D. return 'NO_FILES_FOUND' Returning a string does not provide the structured status object required by the job framework.

Explanation:

Key Issue:
CSRF log entries indicate missing or invalid CSRF tokens in form submissions.
Adding the token in the ISML template is only half the solution—the backend must also validate it.

Why Option A?
✅ Middleware Validates CSRF Tokens
The csrfProtection middleware validates tokens sent from forms.
Add it to controller routes that handle POST/PUT/DELETE requests:
server.post('SubmitForm', csrfProtection.validateRequest, function (req, res, next) {
// Process form data
});

Fixes the Issue: Ensures tokens are checked server-side.

Why Not Other Options?

❌ B. Extend Token Validity
CSRF tokens expire for security reasons. Extending validity increases risk.

❌ C. Delete CSRF Allow List
The allow list safely exempts trusted endpoints (e.g., APIs). Deleting it forces validation on all routes, which may break valid use cases.

Reference:
SFRA CSRF Protection

Explanation:

In Salesforce B2C Commerce, the require() method is the correct way to implement lazy loading of scripts. This allows you to load a module only when it's actually needed during execution.

How require() Supports Lazy Loading:
- require() loads a script only when the line is executed.
- Improves controller performance by avoiding loading unused modules during initial execution.
- Can be placed inside route handlers or functions to defer loading.

Example:
server.get('Show', function (req, res, next) {
    var basketHelper = require('*/cartridge/scripts/helpers/basketHelper');
    basketHelper.processBasket();
    next();
});

Why Other Options Are Incorrect:
A. importPackage() – This is for the old Rhino engine and is not supported in CommonJS-based environments like SFCC.
B. $.ajax() – This is a client-side method for sending HTTP requests using jQuery; it has nothing to do with server-side script loading.
C. local include – This is used in ISML templates to include HTML markup or partials, not JavaScript modules.

Best Practice:
Use require() inside route callbacks or functions to load only what is needed, improving performance and reducing memory usage.

Explanation:

To improve client-side performance in Salesforce B2C Commerce (and web development in general), you want to minimize HTTP requests, reduce file size, and optimize caching. Let’s break down each choice:

✅ B. Place CSS outside of templates
Why: External stylesheets can be cached by the browser, reducing load times on subsequent pages.
Best Practice: Avoid inline or per-template CSS. Load a single, minified stylesheet.

✅ C. Compress CSS
Why: Minification removes unnecessary spaces, comments, and line breaks from stylesheets.
Result: Smaller files → Faster load times

✅ E. Combine several images into a single image (aka CSS Sprites)
Why: Fewer image files = fewer HTTP requests.
How: Use background positioning in CSS to show only the part of the sprite needed for a specific UI element.

❌ A. Use one style sheet for each ISML decorator template
Why it's wrong: Multiple stylesheets increase the number of HTTP requests.
Best Practice: Combine all styles into one compressed stylesheet used across templates.

❌ D. Use inline JavaScript
Why it's wrong: Inline JS increases page size and cannot be cached.
Best Practice: Use external JavaScript files that can be cached and minified.