What must happen for QFabric system RVIs to become active?

What must happen for QFabric system RVIs to become active?

A.
A network Node group is configured on the RVI VLAN.

B.
An operational Layer 2 interface is associated with the RVI VLAN.

C.
A server Node group is configured on the RVI VLAN.

D.
A Layer 3 interface is configured on the RVI VLAN.