What must be done before configuring any routing protocol in a VRF instance?

What must be done before configuring any routing protocol in a VRF instance?
A . Assign an IP address to at least one of the interfaces assigned to the VRF instance
B . Create a routing group for each VRF instance
C . Assign each VRF instance to a routing group
D . Nothing, VRF routing protocols are assigned automatically

Answer: A