Which aaa accounting command is used to enable logging of the start and stop records for user
terminal sessions on the router?

A.
aaa accounting network start-stop tacacs+

B.
aaa accounting system start-stop tacacs+

C.
aaa accounting exec start-stop tacacs+

D.
aaa accounting connection start-stop tacacs+

E.
aaa accounting commands 15 start-stop tacacs+

Explanation:

http://www.cisco.com/en/US/docs/ios/security/command/reference/sec_book.html
aaa accounting
To enable authentication, authorization, and accounting (AAA) accounting of requested services
for billing or security purposes when you use RADIUS or TACACS+, use the aaa accounting
command in global configuration mode or template configuration mode. To disable AAA
accounting, use the no form of this command.
aaa accounting {auth-proxy | system | network | exec | connection | commands level | dot1x}
{default | list-name
| guarantee-first} [vrf vrf-name] {start-stop | stop-only | none} [broadcast] {radius | group groupname}
no aaa accounting {auth-proxy | system | network | exec | connection | commands level | dot1x}
{default | listname
| guarantee-first} [vrf vrf-name] {start-stop | stop-only | none} [broadcast] {radius | group groupname} exec
Runs accounting for the EXEC shell session.
start-stop
Sends a “start” accounting notice at the beginning of a process and a “stop” accounting notice at
the end of a process. The “start” accounting record is sent in the background. The requested user
process begins regardless of whether the “start” accounting notice was received by the accounting
server.