Which two statements about end-host mode in SAN connectivity in a Cisco UCS environment are true？ （）

• A、 End-host mode is synonymous with NPV mode.
• B、 In end-host mode， only hard pinning of vHBAs to Fibre Channel uplink ports is allowed.
• C、 Making configuration changes between Fibre Channel switching mode and end-host mode is nondisruptive.
• D、 End-host mode is the default Fibre Channel switching mode.