What does the switch provide to the Cisco IP phone via Cisco Discovery Protocol when the IP phone power up?

A.
voice VLAN ID (WID)

B.
native VLAN ID (NVID)

C.
priority VLAN (PVAN)

D.
IP address

Explanation:
IP Phones have a bootup sequence. The very first step in the sequence is to send a CDP message to discover the voice virtual LAN information from the switch. The IP Phone then sends a broadcast DHCP request and should receive an IP address, default gateway and TFTP server information. The IP Phone then requests a file from the TFTP server which includes, among other things, the IP address of the CME router. The IP Phone then sends a registration request to the CME router and subsequently receives the phone configuration from this router.