单项选择题

A.to ensure a loop-free topologyB.to protect against us……

Why is STP required when VLANs span access layer switches？（）

A.to ensure a loop-free topology
B.to protect against user-side loops
C.in order to support business applications
D.because of the risk of lost connectivity without STP
E.for the most deterministic and highly available network topology

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