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