A network engineer is configuring IS-IS in Cisco IOS XR. Where is BFD configured?

A.	RP/0/RSP0/CPU0:router(config-isis-if)#
B.	RP/0/RSP0/CPU0:router(config)#
C.	RP/0/RSP0/CPU0:router(config-bfd)#
D.	RP/0/RSP0/CPU0:router(config-isis-if-af)#