Which is the reason the LDP session is not working?

Refer to the exhibit. R1 and R5 routers are not directly connected. Loopback 0 is configured as LDP router- id for both R1 and R5 routers. Loopback 0 IPv4 addresses are reachable between R1 and R5 routes. The LDP session between R1 and R5 is not established. There is no accesslist applied in any routers in the path between R1 and R5.
Which is the reason the LDP session is not working?


A. Targeted LDP works only for directly connected LDP neighbors
B. LDP authentication are missing in both R1 and R5 routers
C. R5 is not configured to accept targeted LDP sessions
D. It is necessary to create a GRE tunnel between R1 and R5 in order to targeted LDP session to work for a no directly connected LDP neighbors

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