Which description is correct about the IGMP Snooping mechanism?

Which description is correct about the IGMP Snooping mechanism?
A . When IGMP Snooping is not running, multicast packets will be broadcast on Layer 2. After IGMP Snooping is run, packets will not be broadcast on Layer 2 but Layer 2 multicast.
B . If the IGMP leave message sent by the host, the switch adds the host to the corresponding multicast table.
C . If the host sends an IGMP host report, the switch deletes the multicast entry corresponding to the host.
D . The Layer 2 switch establishes and maintains a MAC broadcast address table at Layer 2 by continuously monitoring IGMP messages.

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Answer: A