On the Cisco IOS XR, when using the match protocol command within a class-map to classify traffic, you noticed that the

[answerhappygod]

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: class-map 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