What is the purpose of the ip nbar port-map command?

A.
configures stateful NBAR to recognize applications based on dynamic port numbers

B.
configures NBAR to search for a particular protocol using a port number other than the well-known port number

C.
configure NBAR to recognize non-TCP and non-UDP applications

D.
configure NBAR for subport classifications (like HTTP URLs or MIME)

E.
configures NBAR to recognize applications that use FastTrack (like Kazaa, and Morpheus)

Explanation:

To configure Network-Based Application Recognition (NBAR) to search for a protocol or protocol name using a port number other than the well-known port, use the ip nbar port-map global configuration command. To look for the protocol name using only the well-known port number, use the no form of this command.
ip nbar port-map protocol-name [tcp | udp] port-number
no ip nbar port-map protocol-name [tcp | udp] port-number