What does this command do?

What does this command do?
router(config)# ip port-map user-1 port tcp 4001

What does this command do?
router(config)# ip port-map user-1 port tcp 4001

A.
defines a user application in the PAM table where the user-defined application is called “user-1”
and that application is mapped to TCP port 4001

B.
enables application firewall inspection on a user-defined application that is mapped to TCP port
4001

C.
enables NBAR to recognize a user-defined application on TCP port 4001

D.
enables the Cisco IOS Firewall to inspect TCP port 4001 as part of the ip inspect name xxx
TCP inspection rule



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