Which feature restricts multicast packets for each IP multicast group to only those mulicast router ports that have downstream receivers joined to that group?

In a network where a Layer 2 switch interconnects several routers, which feature restricts multicast packets for each IP multicast group to only those mulicast router ports that have downstream receivers joined to that group?
A. PIM snooping
B. IGMP snooping
C. IGMP filter
D. IGMP proxy

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