Evenforonesingleconnection,theretransmissiontimeshouldnotbefixed.Aconnectionmaybeabletosendsegmentsandreceive(74)fasterduringnontrafficperiodthanduringcongestedperiods.TCPusesthedynamicretransmissiontime,atransmissiontimeisdifferentforeachconnectionandwhichmaybechangedduringthesameconnection.
A.connections
B.requests
C.acknowledgments
D.datagrams
正确答案是C