0 AP global configuration parameter AP Primary Discover Timeout?

Which statement describes the purpose of the Cisco WLC v7.0 AP global configuration parameter AP Primary Discover Timeout?

A.
Adjust the AP heartbeat timer to detect the primary controller.

B.
Adjust the AP timeout for missed heartbeats for the primary controller.

C.
Adjust the AP discovery timer of backup controllers.

D.
Adjust the AP boot time discovery of controllers.