On the Cisco IOS XR, when using the match protocol command within a class-map to classify
traffic, you noticed that the match protocol option on the Cisco IOS XR shows much fewer protocol
options than on the Cisco IOS or IOS XE, like there is no option such as the match protocol
yahoo-messenger command on the Cisco IOS XR. Why is this?

A.
because the Cisco IOS XR router does not have the correct software packages installed

B.
because when defining the class-map, the class-map type should be set to type inspect: classmap type inspect class-map-name command

C.
because NBAR is not supported on the Cisco IOS XR

D.
because flexible packet matching has not been enabled on the Cisco IOS XR router

Explanation: