Which statement about H.323 Gatekeeper Call Admission Control is true?

Which statement about H.323 Gatekeeper Call Admission Control is true?

A.
Gatekeeper Call Admission Control applies to centralized Cisco Unified Communications deployments that use locations based Call Admission Control.

B.
Gatekeeper Call Admission Control applies to distributed Cisco Unified Communications deployments.

C.
Gatekeeper Call Admission Control applies only to distributed Cisco Unified Communications Express deployments.

D.
Gatekeeper Call Admission Control setting is configured in Cisco Unified Communications.