What should be remembered when configuring VRF forwarding on an interface?

What should be remembered when configuring VRF forwarding on an interface?

A.
The VRF will be applied to all subinterfaces on that physical interface, they may need reconfiguring.

B.
CEF will be disabled on the interface, it will need to be re-enabled.

C.
The interface will be shutdown, it will need restarting.

D.
The IP address of the interface will be removed, it will need re-entering.