What is the difference between AAA authentication and authorization?

What is the difference between AAA authentication and authorization?

A. Authentication identifies and verifies a user who is attempting to access a system, and authorization controls the tasks the user performs. B. Authentication controls the system processes a user accesses, and authorization logs the activities the user initiates. C. Authentication verifies a username and password, and authorization handles the communication between the authentication agent and the user database. D. Authentication identifies a user who is attempting to access a system, and authorization validates the user's password.