What is the cause of this issue?

An administrator is attempting to add a new IP phone to the network. The phone does not register and continues to cycle through the registration process. The administrator checks and notices that the IP address assigned to the phone is not in the correct network.

What is the cause of this issue?
A . The TFTP server is misconfigured.
B . The DHCP server is giving out false IP addresses.
C . The Cisco Unified Communications Manager is down.
D . The switch port that the phone is connected to is configured with the wrong voice VLA
F . The PSTN gateway is down.

Answer: D