单选题Which statement best describes echo?（）AEcho is the discernable leak-through of your own Rx path into your own Tx path. BEcho is the discernable leak-through of the packets of your Rx path into your own Tx path. CEcho is the nonaudible leak-through of the packets of your Rx path into your own Tx path. DEcho is the audible leak-through of the packets from the transmit path into your own receive path. EEcho is the nonaudible leak-through of the packets of your Tx path into your own Rx path.
单选题
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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