If a service is currently deactivated, how can the service be reactivated from the Cisco Unified Communications Manager Serviceability Control Center page?

A.
by clicking on the radio button to the left of the service on the Control Center page

B.
by selecting Cisco Unified CM Serviceability > Tools, clicking on the radio button to the left of the service that needs to be activated, and then returning to the Control Center to activate the service

C.
by selecting Tools > Service Activation, selecting the correct server, and clicking on the radio button to the left of the service to activate it

D.
by selecting Cisco Unified CM Serviceability > Service Activation and then clicking on the radio button to the left of the service to activate it