Which benefit of the Cisco Spark Hybrid Call Service, Call Service aware is true?

Which benefit of the Cisco Spark Hybrid Call Service, Call Service aware is true?
A . It allows users to make and receive calls on their Cisco device or Spark application using the same dialing procedure as with on-premises registered endpoints.
B . It allows third-party endpoints to register to the Cisco Spark Cloud.
C . lt allows the Cisco Spark App to register to the Cisco Unified Communication Manager.
D . lt allows simple screen sharing between the two users.

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Answer: D