Refer to the exhibit.

Which statement about the given configuration is true?

A.
The single-connection command causes the device to establish one connection for all TACACS
transactions.

B.
The single-connection command causes the device to process one TACACS request and then move to the
next server.

C.
The timeout command causes the device to move to the next server after 20 seconds of TACACS inactivity.

D.
The router communicates with the NAS on the default port, TCP 1645.

Explanation:
BD
tacacs-server host host-name [port integer] [timeout integer] [key string] [single-connection] [nat]
The single-connection keyword specifies a single connection (only valid with CiscoSecure Release 1.0.1 or
later). Rather than have the router open and close a TCP connection to the server each time it must
communicate, the single-connection option maintains a single open connection between the router and the
server. The single connection is more efficient because it allows the server to handle a higher number of
TACACS operations.
Source: http://www.cisco.com/c/en/us/td/docs/ios/12_2/security/command/reference/srftacs.html