WhichtwostatementsaboutthevariousimplementationsofSTParetrue?()

A.monSpanningTreemaintainsaseparatespanning-treeinstanceforeachVLANconfiguredinthenetwork.

B.TheSpanningTreeProtocol（STP）isanevolutionoftheIEEE802.1wstandard.

C.Per-VLANSpanningTree（PVST）supports802.1Qtrunking.

D.Per-VLANSpanningTreePlus（PVST+）isanenhancementto802.1QspecificationandissupportedonlyonCiscodevices.

E.RapidSpanningTreeProtocol（RSTP）includesfeaturesequivalenttoCiscoPortFast，UplinkFast，andBackboneFastforfasternetworkreconvergence.

F.MultipleSpanningTree（MST）assumesonespanning-treeinstancefortheentireLayer2network，regardlessofthemultiplenumberofVLANs