Option C: Handle low-level events in the event handler and re-fire them as higher-level events.
True.
It's a best practice to encapsulate lower-level events and re-emit them as higher-level, application-specific events to decouple components and simplify event handling.
Placing reusable logic in the helper aids in maintaining clean code and promotes reusability across the component's controller and renderer.
Best practice recommends using component events when possible.
Application events should be used sparingly due to their performance impact and broader scope.
Component events are designed for parent-child communication.
For application-level communication, application events are appropriate.
Reference:
Lightning Components Best Practices
Option D: Reuse the event logic in a component bundle, by putting the logic in the helper.
True.
Helper Functions
Option A: Try to use application events as opposed to component events.
False.
Component Events vs. Application Events
Option B: Use component events to communicate actions that should be handled at the application level.
False.
Event Communication Patterns
Conclusion:
The best practices are C and D.