单选题Which configuration is used to enable root guard？（）Ainterface gig3/1 spanning-tree guard rootBinterface gig3/1 spanning-tree root guardCinterface gig3/1 spanning-tree root-guardDinterface gig3/1 spanning-tree root-guard default
单选题
Which configuration is used to enable root guard？（）
A
interface gig3/1 spanning-tree guard root
B
interface gig3/1 spanning-tree root guard
C
interface gig3/1 spanning-tree root-guard
D
interface gig3/1 spanning-tree root-guard default
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