Which of the following is true concerning best design practices at the switched Access layer of thetraditional layer2 Enterprise Campus Network？（）

• A、 Cisco NSF with SSO and redundant supervisors has the most impact on the campus in theAccess layer
• B、 Provides host-level redundancy by connecting each end device to 2 separate Access switches 
• C、 Offer default gateway redundancy by using dual connections from Access switches toredundant Distribution layer switches using a FHRP
• D、 Include a link between two Access switches to support summarization of routing information