What is the primary difference between AAA authentication and authorization?

What is the primary 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 can perform.
B. Authentication controls the system processes a user can access, 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.

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