How does TACACS+ implement AAA?

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

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

C.
Authentication, Authorization and Accounting are in separate exchanges.
Authentication and Authorization happen on the same TCP encrypted connection ; Accounting data is carried unencrypted over UDP.

D.
Authentication, Authorization and Accounting are in separate exchanges, yet on the same TCP 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 transport. Only passwords are encrypted.
Accounting data is carried unencrypted over
another UDP transport.