What is required on a Cisco IOS XR router to assign an interface to a VRF?

What is required on a Cisco IOS XR router to assign an interface to a VRF?
A . Assign the VRF to the interface, and then re-enable Cisco Express Forwarding on the interface.
B . Assign the VRF to the interface, and then reset the CE-to-PE routing protocol process.
C . Shut the interface, assign the VRF to the interface, and then no shut the interface.
D . Remove the IP address configuration on the interface, assign the VRF to the interface, and then reconfigure the IP address on the interface.

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Answer: D