WhichfourCiscoprioritySpanningTreeProtocolenhancementsaresupportedwithrapidper－VLANSpanningTree？（）

A.PortFast
B.UplinkFast
C.loopguard
D.rootguard
E.BPDUguard
F.BackboneFast

【参考答案】

A, C, D, E