Refer to the partial Cisco IOS XR configurations exhibit for Router 1 and Router 2.
There are two routers that are connected back to back over the Gigabit Ethernet link. If the "show mpls ldp neighbor" command output on Router 1 does not show LDP peering with Router 2, what could be the possible root cause of the LDP peering problem?
A . missing interface under OSPF IGP configuration
B . hello timers mismatch on Router 1 and Router 2
C . password for LDP session mismatch on Router 1 and Router 2
D . MPLS LDP session protection is not configured
Answer: A