What happens if CDP is not enabled on a switch port to which an IP phone is connected?

What happens if CDP is not enabled on a switch port to which an IP phone is connected?
A. The phone is unable to acquire an IP address.
B. The phone cannot get its VLAN ID assignments.
C. The phone cannot learn the address of the TFTP server.
D. The switch will put the port into the errDisable state until CDP is enabled.

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