Which configuration is applied to prevent the network from a Layer 2 flooding of multicast frames with a seamless transfer of multicast data to the client when roaming from one controller to another?

Which configuration is applied to prevent the network from a Layer 2 flooding of multicast frames with a seamless transfer of multicast data to the client when roaming from one controller to another?
A . Enable IGMPv3 on the central Layer 3 switch.
B. Enable IGMP snooping on the WLC.
C. Enable multicast mode on the WLC.
D. Create multicast groups on the central Layer 3 switch.

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Answer: B