How is Layer 3 roaming accomplished in a unified wireless deployment?

How is Layer 3 roaming accomplished in a unified wireless deployment?
A . An EoIP tunnel is created between the client and the anchor controller to provide seamless connectivity as the client is associated with the new AP.
B. The client entry on the original controller is passed to the database on the new controller.
C. The new controller assigns an IP address from the new subnet to the client
D. The client database on the original controller is updated the anchor entry, and the new controller database is updated with the foreign entry.

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Answer: D