A.A based opt-in model uses virtualized identifiers
B.A based opt-in model uses hardware values as identifiers
C.A logical server opt-in model uses virtualized identifiers
D.A logical server opt-in model uses hardware values as identifiers

A.Fabric interconnect can never participate in VTP
B.Fabric interconnect supports ISL and 802.1Q trunking
C.The supported range of VLANs is auto-configured by UCS
D.VLANs are configured through the Cisco UCS manager. （fabric interconnect may be set up in switch mode）