Which option do all aspects of the Unified Communications and Collaboration system rely on?

Which option do all aspects of the Unified Communications and Collaboration system rely on?
A . licensing that is purchased
B . administrator security rights
C . proper design and deployment of the system architecture
D . proper delegation of tasks during the sales cycle and deployment

Answer: C

Explanation:

All aspects of the Unified Communications and Collaboration System, including call routing, call control, applications and services, and operations and serviceability, rely heavily on proper design and deployment of the system architecture.

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab09/clb09/ovarchit.pdf