The following statement about the concept of multicast is wrong?

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Multicast Source: The sender of the message needs to join the multicast group to provide forwarding of multicast group messages

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Multicast router: A router or layer-three switch that supports layer-3 multicast functionality

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Multicast Group Members: Multicast group members can be widely distributed anywhere in the network

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Multicast Groups: A collection identified by ip multicast addresses

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