Which statement about Cisco Unified Fabric switches is correct？ （）   

• A、 The Nexus 5000 family of switches does not support vPC when running in either NPV or FCoE NPV mode.
• B、 The MDS 9100 family of switches is an excellent design choice as a Unified Fabric edge switch. 
• C、 The Nexus 7000 Series Switches can support the NPIV mode of operation， but cannot function as a complete Fibre Channel Forwarder.
• D、 The Nexus 7000 Series Switches cannot support advanced Cisco Fibre Channel features such as IVR.
• E、 The MDS family of Cisco Unified Fabric switches supports both the Fibre Channel Forwarder and Fibre Channel Bridge functions.