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下面是SWC上运行STP的端口的Display信息显示,请根据这些配置信息,判断该端口的角色为[SWC]displaystpinterfaceEthernet0/20Port20(Ethernet0/20)ofbridgeisForwardingPortspanningtreeprotocol:enabledPortrole:DesignatedPortPortpathcost:200Portpriority:128DesignatedbridgeID(Pri.MAC):4096.00e0-fc41-4259ThePortisanon-edgedportConnectedtoapoint-to-pointLANsegmentMaximumtransmissionlimitis3Packets/hellotimeTimes:HelloTime2sec,MaxAge20secForwardDelay15sec,MessageAge0BPDUsent:4TCN:2,RST:2,ConfigBPDU:0BPDUreceived:806TCN:0,RST:11,ConfigBPDU:795

(A)该端口为根端口

(B)该端口为指定端口

(C)该端口为预备端口

(D)以上说法都不正确

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