Which statement about BFD on Cisco IOS XR Software is true?

A.	Cisco IOS XR router must use LDP to route back to the Cisco IOS router to establish the peer relationship.
B.	Cisco IOS XR Software does not support BFD multihop for IPv4.
C.	Cisco IOS XR router must use dynamic routing or a static route back to the Cisco IOS router to establish the peer relationship.
D.	BFD is not compatible between Cisco IOS XR and Cisco IOS Software.