What function does the device pool perform?
A. It separates user and physical location information.
B. It sets the default device parameters for all IP phones in the cluster.
C. It sets the location bandwidth used between different locations.
D. It provides a single point of configuration for every device in a Cisco Unified Communications Manager cluster.
A it’s fine
Device pools define sets of common characteristics for devices. The device pool structure supports the separation of user and location information. The device pool contains system, device, and location-related information.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/8_6_1/ccmcfg/bccm-861-cm/b02devpl.html
This should be D