单项选择题

WhenNICteamingisused,howareLoopsavoidedinavirtualswitch?()

A.Byusingactive/passiveteamingwithspanningtreeontheactiveIink
B.Byusingactive/passiveteamingwithonIytheactiveIinkinuse
C.Byusingactive/activateteamingwithVMutilizingbothuplinkports
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