单项选择题
WhichofthefollowingistrueconcerningbestdesignpracticesattheswitchedAccesslayerofthetraditionallayer2EnterpriseCampusNetwork？（）
A.CiscoNSFwithSSOandredundantsupervisorshasthemostimpactonthecampusintheAccesslayer
B.Provideshost-levelredundancybyconnectingeachenddeviceto2separateAccessswitches
C.OfferdefaultgatewayredundancybyusingdualconnectionsfromAccessswitchestoredundant
D.IncludealinkbetweentwoAccessswitchestosupportsummarizationofroutinginformation