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单项选择题

Which statement best describes echo?()

A.Echo is the discernable leak-through of your own Rx path into your own Tx path. 
B.Echo is the discernable leak-through of the packets of your Rx path into your own Tx path. 
C.Echo is the nonaudible leak-through of the packets of your Rx path into your own Tx path. 
D.Echo is the audible leak-through of the packets from the transmit path into your own receive path. 
E.Echo is the nonaudible leak-through of the packets of your Tx path into your own Rx path.

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