Explanation:

Cloud Kicks (CK) currently uses Data Category Visibility to restrict access to Knowledge Articles based on products and geographic regions.

However, the admin now plans to enable “Use standard Salesforce sharing” in Knowledge Settings, which fundamentally changes how article access is controlled.

🔍 C. Data Categories no longer control access to articles ✅
When you enable “Use standard Salesforce sharing”:
Salesforce applies record-level sharing rules to Knowledge Articles
This uses organization-wide defaults (OWDs), sharing rules, and role hierarchy
Data Category Visibility is no longer enforced for access control
Instead, categories become filters and organizational tools
You can still use categories for search filtering and organization, but not for access control
This change can expose articles to users who previously couldn't access them via Data Category restrictions
✅ Critical consideration before enabling this setting

🔍 A. Data Category Visibility of All Categories provides Public Read-Only access
This statement is misleading and technically incorrect
Data Category Visibility settings (e.g., All Categories, Custom, None) control category access, but do not directly grant public access
Also, once “Use standard Salesforce sharing” is enabled, Data Category Visibility settings are ignored
🔴 Not true under the new sharing model

🔍 B. Data Category Visibility of Custom overrides org-wide default sharing access
Incorrect
Standard Salesforce sharing (OWDs, roles, sharing rules) will override any Data Category visibility
Once enabled, Data Category Visibility no longer controls access to the articles
🔴 Opposite of what actually happens

📚 References:
Salesforce Help: Enable Standard Salesforce Knowledge Sharing
“When you enable standard sharing, Salesforce uses record-level sharing mechanisms instead of data category visibility to control article access.”
Trailhead: Knowledge Basics

✅ Final Answer: C. Data Categories no longer control access to articles.
Because enabling standard Salesforce sharing disables Data Category Visibility as an access control method — a critical consideration when shifting access strategy.