After an IP phone has been added to a Cisco Unified Communications Manager server, the administrator notices that the phone has a directory numberthat is not in the number range in use by the organization. He also notes that the directory number is 1000. What is the most likely cause?
A. The phone number was misconfigured.
B. The phone may have auto-registered.
C. The phone is configured on another server.
D. DHCP gave the phone the wrong directory number
E. TFTP server is misconfigured