What application uses the Cisco Unified Operating System for administration and configuration?

A.
Cisco Unity Express

B.
Cisco Unified Messaging Gateway

C.
Cisco Unified Communications Manager Express

D.
Cisco Unified Presence

Explanation:
Cisco unity is for voice mail feature. Cisco unified operating system is CUCM/CCME
feature.
Link:
http://www.cisco.com/en/US/docs/voice_ip_comm/cups/1_0_3/administration/administration/guide/

b02trsht.html