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Whichofthefollowingcommandscanbeissuedwithoutinterferingwiththeoperationofloopguard?()
A.Switch(config-if)#spanning-treeguardroot
B.Switch(config-if)#spanning-treeportfast
C.Switch(config-if)#switchportmodetrunk
D.Switch(config-if)#switchportmodeaccess
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