How is MSDP used to interconnect multiple PIM-SM domains?

How is MSDP used to interconnect multiple PIM-SM domains?
A . MSDP depends on BGP or multiprotocol BGP for mterdomam operation
B . MSDP SA request messages are used to request a list of active sources for a specific group
C . SDP allows a rendezvous point to dynamically discover active sources outside of its domain
D . MSDP messages are used to advertise active sources in a domain

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Answer: A