How does the replicator role function in cisco SD-WAN?

How does the replicator role function in cisco SD-WAN?
A . WAN Edge devices advertise the rendezvous point to all the receivers through the underlay network.
B . vSmart Controllers advertise the rendezvous point to all the receivers through the overlay network.
C . WAN Edge devices advertise the rendezvous point to all receivers through the overlay network.
D . vSmart Controllers advertise the rendezvous point to all the receivers through the underlay network.

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Answer: B