What is the function of the multicast Reverse Path Forwarding check?

What is the function of the multicast Reverse Path Forwarding check?
A . It allows for a loop-free distribution tree from the source to receivers.
B . It serves as an Auto RP Mapping agent.
C . It prevents bootstrap messages from reaching all routers.
D . It is used to discover and announce RP-set information.

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Answer: A