A.The source address of a multicast packet is a unicast address.

B.If a multicast data packet fails the RPF check, the packet must have been received through a sub-optimal interface. However, this interface still receives and forwards the multicast traffic downstream.

C.IGMP snooping cannot control the scope of multicast traffic flooding on a Layer 2 network.

D.In multicast transmission, the destination address of a packet can be the unicast address of a host.