Whichthreestatementsaboutend－to－enddelayaretrue?()

A.End-to-enddelayisthesumofpropagationdelays，processingdelays，serializationdelays，andqueuingdelays.

B.Coast-to-coastend-to-enddelayoveranopticallinkisabout20ms.

C.Processingdelaydependsonvariousfactors，whichincludeCPUspeed，CPUutilization，IPswitchingmode，androuterarchitecture.

D.Propagationandserializationdelaysarerelatedtothemedia.

E.Propagationdelayisthetimeittakestotransmitapacketandismeasuredinbits-per-second（bps）.

F.Serializationdelayisthetimeittakesforaroutertotakethepacketfromaninputinterfaceandputitintotheoutputqueueoftheoutputinterface.