When forwarding a multicast frame, the normal behavior for a LAN switch with IGMP snooping enabled is to forward the frame based on the similar rules as if it were:
A . A unicast frame with a known destination in the forwarding table
B . A unicast frame with an unknown destination in the forwarding table
C . A unicast frame with a known source in the forwarding table
D . A unicast frame with an unknown source in the forwarding table
Answer: A