Question: What is `before_action` (formerly known as `before_filter`)?
- A trigger that is executed before an alteration of an object's state
- A method that is executed before an ActiveRecord model is saved
- A callback that fires before an event is handled
- A method in a controller that is executed before the controller action method
Answer: The correct answer of the above question is Option D:A method in a controller that is executed before the controller action method