Which action should be performed on the routers to accomplish this task?

A network engineer is configuring RIP as the routing protocol between multiple PEs and CEs. The engineer must avoid advertising the same routes back to their sources.

Which action should be performed on the routers to accomplish this task?
A . Configure a different route distinguisher for each prefix.
B . Define the site of origin on each interface.
C . Define VRFs on each device to separate the traffic.
D . Enable bidirectional forwarding detection on each device.

Answer: A