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【多选题】
Which three IP multicast group concepts are true?（）A.
If a packet is sent to a multicast group address, the multicast frame contains the source multicast address.
B.
A router does not have to be a member of a multicast group to receive multicast data.
C.
A router must be a member of a multicast group to send to the group.
D.
A router does not have to be a member of a multicast group to send to the group.
E.
If a packet is sent to a multicast group address, all members of the multicast group will rece ive it.
F.
A router must be a member of a multicast group to receive multicast data.
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