In what Cisco solution is Simple Network-Enabled Auto Provision technology used?

A.
Cisco Unified Gateway Duplication

B.
Cisco Unified CallManager Redundancy

C.
Cisco Unified SRST

D.
Cisco Unified Call Survivability

Explanation:
When the system automatically detects a failure, Cisco Unified SRST uses Simple Network Auto Provisioning (SNAP) technology to auto-configure a
branch office router to provide call processing for the Cisco Unified IP phones that are registered with the router
Link: http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/admin/configuration/guide/cmesrst.html