Why do you use request objects in the event handlers? Note: There are 3 correct answers to this question.

Why do you use request objects in the event handlers? Note: There are 3 correct answers to this question.
A . To give information on the HTTP method
B. To call external services
C. To register another set of handlers
D. To send an arbitrary event
E. To provide error messages to the client

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Answer: A,B,E