Whichofthefollowingcommandscanbeissuedwithoutinterferingwiththeoperationofloopguard?() A.Switch（config-if）#spanning-treeguardrootB.Switch（config-if）#spanning-treeportfastC.Switch（config-if）#switchportmodetrunkD.Switch（config-if）#switchportmodeaccess

Whichofthefollowingcommandscanbeissuedwithoutinterferingwiththeoperationofloopguard?()

A.Switch（config-if）#spanning-treeguardroot

B.Switch（config-if）#spanning-treeportfast