单项选择题

Refer to the exhibit. Look at the command output. What can you use to prevent this behavior？（）

A.UDLD
B.spanning-tree loopguard
C.VTP mode transparent
D.switchport mode desirable

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单项选择题

Refer to the exhibit. Look at the command output. Assume that there is no other path，and the configuration is correct. What would be the consequences of this situation？（）

A.Users in SW1 can ping SW2 but not vice versa.
B.Users in SW2 can ping SW1 but not vice versa.
C.Users in SW1 and SW2 can ping each other.
D.Users in SW1 and SW2 cannot ping each other.