On which routers is "advertise-external* needed for router R6 to receive exactly two distinct routes for prefix 192.168.1.0/27?

Click the exhibit.

Router R6 is a route reflector for clients R1, R2 and R5. Router R5 is configured with a local preference of 200.

On which routers is "advertise-external* needed for router R6 to receive exactly two distinct routes for prefix 192.168.1.0/27?
A . On router R5 only.
B . On either router R1or R2.
C . On both routers R1and R2.
D . On all routers R1, R2 and R5.

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Answer: B