单项选择题

AGREtunnelisconfiguredbetweenalocalandaremotesite.Whereshouldtheservicepolicybeappliedtoclassifypacketsbasedonthepretunnelheader?（）

A.inglobalconfigurationmode，applytheservicepolicyandusetheqospre-classify
B.inglobalconfigurationmode，applytheservicepolicybutdonotusetheqospre-classifycommand
C.applytheservicepolicyonthephysicalinterfacebutdonotusetheqospre-classify
D.applytheservicepolicyonthetunnelinterfacebutdonotusetheqospre-classifycommand
E.applytheservicepolicyonthetunnelinterfaceandusetheqospre-classifycommand

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Forthefollowingports，whichportisoneverybridgeinaSpanningTreeProtocolIEEE802.1wnetworkexcepttherootbridge？（）

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