Which of the following is wrong about multicasting? (Multiple choices)

Which of the following is wrong about multicasting? (Multiple choices)
A . The unicast technology and broadcast technology can’t solve the problem of single send and multi-point receive. Only multicast technology can solve it.
B . Multicast technology is used in most "single-to-multiple" data distribution applications.
C . Because multicast technology is based on TCP, multicast technology can ensure the reliable transmission of packets.
D . Multicast technology can reduce redundant traffic and save network bandwidth.

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Answer: AC