Which three statements best describe multicast operation on Cisco Nexus switches in a data center？（）
- A Cisco NX-OS Software does not support PIM dense mode.
- B The command ip multicast-routing must be enabled in Cisco NX-OS Software before any multicast configuration is possible on the switch.
- C PIM CLI configuration and verification commands are not available until you enable the PIM feature with the feature pim command.
- D Cisco NX-OS Software supports multicast routing per Layer 3 VRF instance.
- E The default PIM operational mode on the Cisco Nexus 7000 switch is SSM.