Trace Flags in Salesforce are used to set logging levels for various entities to debug and monitor execution. They can be configured for:
Apex Classes (Option C):
You can set a trace flag for a specific Apex class to monitor its execution and debug logs.
Reference:
Apex Triggers (Option B):
Similar to classes, trace flags can be set for Apex triggers to capture debug logs when the trigger executes.
Users (Option E):
Trace flags can be set for specific users to capture logs for all actions performed by the user.
This is useful for tracking issues specific to a user's experience.
Items Not Applicable:
Visualforce (Option A):
Trace flags cannot be directly configured for Visualforce pages.
While you can capture logs when a Visualforce page invokes Apex code, there is no direct trace flag for the page itself.
Flow (Option D):
Trace flags cannot be set directly on Flows.
Debugging Flows is done through different mechanisms like the Flow Debug logs and using the Flow Debug tool.
Conclusion:
Trace flags can be configured for Apex Classes (C), Apex Triggers (B), and Users (E).