An administrator is attempting to add a new IP phone to the network. The phone does not register and continues to cycle through the registrationprocess. The administration checks and notices that the IP address assigned to the phone is not correct network. What is the cause of this issue?
A. The TFTP server is reconfigured
B. The DHCP server is giving out false IP addresses
C. The Cisco Unified Communication Manager is down
D. The switch port that the phone is connected to is configured with the wrong voice LAN
E. The PSTN gateway is down
