A、 If a packet is sent to a multicast group address， all members of the multicast group will receive it

B、 If a packet is sent to a multicast group address， the multicast frame contains the source multicast  address

C、 A router does not have to be a member of a multicast group to receive multicast data.

D、 A router does not have to be a member of a multicast group to send to the group.

E、 A router must be a member of a multicast group to receive multicast data.

F、 A router must be a member of a multicast group to send to the group.