单项选择题

InwhichofthefollowingscenarioswouldMACfilteringbeMOSTeffectiveasapartofwirelesssecurity?()

A.Apublicplacewhereguestsarefreetoaccessthewirelessnetwork.
B.Asmallofficewhereadefinednumberofspecificwirelessdevicesareused.
C.Ameetingroomwherevariouscompanyuserswillaccessthewirelessnetworkduringmeetings.
D.AnofficewheresomeusersareunabletouseWPAencryptionduetoolderwirelesscardssotheyuseMACfiltering.
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