Explanation:

According to MuleSoft’s API-led connectivity approach and the API Lifecycle concepts, modern APIs are treated as products rather than just technical interfaces or code artifacts.

Why “products”?

They have consumers (internal or external developers, partners, apps, etc.)
They come with documentation and usage agreements
They are versioned, governed, secured
They are monitored for usage and performance
They deliver business value and can even be monetized

So, APIs aren’t merely code (D is wrong), or tied to a protocol like REST or SOAP (B and C are wrong).

Why Not The Others?

B. SOAP APIs → SOAP is one implementation style. Modern APIs can be REST, SOAP, GraphQL, Async APIs, etc.
C. REST APIs → Modern APIs are not defined solely by the REST architectural style.
D. Code → Modern APIs expose business capabilities via contracts; they are much more than just code.

Explanation:

MuleSoft provides built-in debugging tools in Anypoint Studio to troubleshoot Mule applications effectively.

Debugger Component (Correct Answer)

- Anypoint Studio includes a built-in debugger for:
- Setting breakpoints.
- Inspecting variables, payloads, and attributes.
- Stepping through flows line by line.
- Works seamlessly with Mule runtime during local development.

Why Not the Others?

- A. Deploying apps on production ❌
Debugging in production is risky and inefficient—use logs instead.

- B. Checking RAML specifications ❌
RAML defines API contracts but doesn’t help debug runtime flow behavior.

- D. Third-party debugger applications ❌
While possible, MuleSoft’s native debugger is the standard and integrated solution.

How to Debug in Anypoint Studio?

1. Set breakpoints in your flow.
2. Right-click the project → Debug As → Mule Application.
3. Use the Debug perspective to inspect messages.

Explanation:

Accessing Properties in DataWeave:
In Mule 4, you use the p() function to read application properties (e.g., db.port) in DataWeave.
Syntax: p('property.key') (e.g., p('db.port') returns the value of db.port).

Correct Expression:
dataweave { port : p('db.port') } // Output: { "port": "3306" } (if db.port=3306)

Why Not Other Options?

B: {db:port} is invalid syntax (no p() function).
C: p['db.port'] uses array notation, which is incorrect for properties.
D: Incorrect. Properties can be accessed in DataWeave via p().

Explanation: In this case as outbound call is made using HTTP: POST /child , all attributes will be replaced by this invocation. Hence query parameter will not be accessible at logger.

Explanation:

The DataWeave map operator has the signature

map < T, R > ( items : Array < T > , mapper : ( item : T , index : Number ) - > R ) : Array < R >

It always returns a new array whose elements are the results of applying the mapper function to each item in the input array.
In other words, map takes an Array as input and produces another Array as output2.