Which two options are two problems that can occur with this co

　　Which two options are two problems that can occur with this configuration? (Choose two)

A.The MPLS path from R1 to R5 becomes unreachable.

B.R1 and R5 are unable to establish an LDP relationship.

C.The label for the R5 loopback address is filtered from other MPLS routers.

D.MPLS traffic from R1 to R5 takes a suboptimal path.

正确答案是AC