单项选择题
Which two statements are true about the protocols that are used for transmitting voice traffic？（）
A.RTP multiplexing is used to keep multiple phone conversations separate
B.RTP provides end-to-end delivery services for voice traffic
C.UDP is used to ensure a reliable transmission from sender to receiver
D.RTP is used to provide resource reservation for the voice stream
E.UDP provides multiplexing
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F.differentiated services （DiffServ） -
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