Under what circumstances should an administrator prefer local VLANs over end-to-end VLANs？（）
A、Eighty percent of traffic on the network is destined for Internet sites.
B、There are common sets of traffic filtering requirements for workgroups located in multiple  buildings.
C、Eighty percent of a workgroup’s traffic is to the workgroup’s own local server.
D、Users are grouped into VLANs independent of physical location.
E、None of the other alternatives apply
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