I think C:
https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/bridging-routing-segmentation-qos/vedge/bridging-routing-segmentation-qos-book/multicast-overlay-routing.html
Replicators
For efficient use of WAN bandwidth, strategic vEdge routers can be deployed and configured as replicators throughout the overlay network. Replicators mitigate the requirement for an ingress router to replicate a multicast stream once for each receiver.
The Cisco SD-WAN design optimizes multicast packet distribution throughout the overlay network by eliminating packet replication on the ingress router, that is, on the router connected to a multicast source. Instead, the ingress router forwards multicast streams to a vEdge router that is designated to be a replicator, and it is this router that forwards streams to multicast receivers. This design saves bandwidth and computational resources on the ingress router.
C. multicast-replicator
The multicast-replicator feature is used to optimize WAN bandwidth of IGMP network traffic among WAN Edge routers in the same VPN. By enabling multicast replication on the WAN Edge routers, multicast traffic is only forwarded to the required routers, thereby reducing unnecessary traffic and optimizing the WAN bandwidth utilization.
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