Which one of the following descriptions is correct, assuming that all the IGMP join, PIM join and multicast traffic are for the same multicast group?

Refer to the exhibit.

Which one of the following descriptions is correct, assuming that all the IGMP join, PIM join and multicast traffic are for the same multicast group?
A .  IGMP is enabled on Router A and B’s interfaces facing the switch. PIM is not enabled on Router A and B’s interfaces facing the switch. IGMP snooping is enabled on the switch.
B .  IGMP is enabled on Router A and B’s interfaces facing the switch. PIM is not enabled on Router A and B’s interfaces facing the switch. IGMP snooping is not enabled on the switch.
C .  IGMP is enabled on Router A and B’s interfaces facing the switch. PIM is enabled on Router A and B’s interfaces facing the switch. IGMP snooping is enabled on the switch.
D .  IGMP is enabled on Router A and B’s interfaces facing the switch. PIM is enabled on Router A and B’s interfaces facing the switch. IGMP snooping is not enabled on the switch.

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Answer: B