Which action does the Calling Service of Cisco Spark Hybrid enable?
A . Intergrade UCM or HCS with the Cisco Collaboration Cloud.
B . Launch a meeting.
C . Schedule a WebEx meeting with an automatically created and associated Spark room.
D . Synchronize the current Active Directory of a customer with the Cisco Collaboration Cloud.
Reference: https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Collaboration/hybrid/12x/hybcvd/ hcallsvc.pdf