单项选择题
Whichstatementistrueaboutthecomponentsofaqueuingmechanism?()
A.Eachsubinterfacehasitsownhardwarequeueandcanexperiencecongestionjustlikeitsmaininterface
B.Hardwarequeuingisonlyusedifthesoftwarequeuesareexperiencingcongestion.
C.Hardwarequeuesandsoftwarequeuesarenotusedconcurrently.
D.ThehardwarequeuingsystemalwaysusestheFIFOqueuingmechanism.