What is the purpose of TACACS?

A.
Provides fine-grained control over user capabilities for the duration of the user’s session,
including but not limited to setting autocommands,
access control, session duration, or protocol support

B.
Identifies start and stop times, executed commands (such as PPP), number of packets, and
number of bytes

C.
Provides centralized validation of users attempting to gain access to a router or network access
server

D.
Allows complete control of authentication through login and password dialog, challenge and
response, messaging support