R2 is receiving an EBGP route from R1. R3 is correctly receiving the route, but R4 is not.
How would you resolve this problem?

A.
Change the R2, R3, and R4 peering session types to external.

B.
Configure an IBGP session between R2 and R4.

C.
Add a route reflector to AS 65501.

D.
Configure a static route between R2 and R4.