How is AP redirected to a local controller after the DNS resolution returns the master controller IP address?

How is AP redirected to a local controller after the DNS resolution returns the master controller IP address?
A . The AP provides the AP name to the controller from the environment variables, and the master controller returns the AP Group. The AP uses the controller-ip attribute that is set in AP Provisioning.
B . The master controller provides the AP Group based upon the AP name, and the AP uses the AP Group controller-ip attribute.
C . The master controller provides the AP Group to the AP, and the AP uses the LMS-IP from the AP-System profile configured for the AP Group.
D . The master controller provides the LMS-IP from the AP Group, and the AP uses the LMS-IP that is set in the AP Provisioning based upon the AP Group.

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Answer: A