Refer to the exhibit. A large enterprise streams training videos from a server connected to R4 to hosts connected to R5. PIM-SM is configured in the network using IGMPv2, with R2 serving as the RP. OS

Enabling MDT address family in BGP is related to multicast VPNs and not directly to the transition from PIM-SM to SSM on the core network.

Changing PIM-SM to PIM-DM would change the multicast forwarding mode from sparse to dense, which is not the same as migrating to SSM and typically leads to inefficient flooding.

Source-Specific Multicast (SSM) requires Internet Group Management Protocol Version 3 (IGMPv3) on the hosts to specify both the multicast group address and the source address. Without IGMPv3, hosts cannot indicate a specific source, which is fundamental to SSM's operation.

In Source-Specific Multicast (SSM), there is no need for a Rendezvous Point (RP) because receivers explicitly join multicast groups from specific sources, eliminating the RP's role in source discovery.