Whichstatementbestdescribesecho?()
A.Echoisthediscernableleak-throughofyourownRxpathintoyourownTxpath.
B.Echoisthediscernableleak-throughofthepacketsofyourRxpathintoyourownTxpath.
C.Echoisthenonaudibleleak-throughofthepacketsofyourRxpathintoyourownTxpath.
D.Echoistheaudibleleak-throughofthepacketsfromthetransmitpathintoyourownreceivepath.
E.Echoisthenonaudibleleak-throughofthepacketsofyourTxpathintoyourownRxpath.
正确答案：参考D
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