Which roaming situation using controllers in a Cisco Unified Wireless Network requires a client using WPA2 with PKC to reauthenticate to the network?

Which roaming situation using controllers in a Cisco Unified Wireless Network requires a client using WPA2 with PKC to reauthenticate to the network?
A . A wireless client roams to another AP on a different controller in the same mobility domain.
B . A wireless client roams to another AP on the same controller.
C . A wireless client roams to another AP after being out of range of the network for 2 minutes.
D . A wireless client roams to another AP on a controller in a different mobility domain.

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Answer: D