How does RADIUS implement AAA?

A.
Authentication, Authorization and Accounting are in separate exchanges, yet on the same UDP connection. The entire connection
is encrypted.

B.
Authentication, Authorization and Accounting are in separate exchanges and each occurs on a different UDP connection. Only the
authentication connection is encrypted.

C.
Authentication, Authorization and Accounting are in separate exchanges and each occurs on a different UDP connection. Only the
password in the authentication connection is encrypted.

D.
Authentication, Authorization and Accounting are in separate exchanges, yet on the same UDP connection. Only passwords are
encrypted.

E.
Authentication and Authorization is combined in one exchange. Accounting happens in a separate exchange. Authentication and
Authorization data are carried on a UDP connection. The user password is encrypted.
Accounting data is carried unencrypted
over another UDP connection.