On a cisco catalyst switch which command is required to send CDP packets on a switch port that configures a cisco IP phone to transmit voice traffic in 802.1q frames tagged with the voice VLAN ID 221?

On a cisco catalyst switch which command is required to send CDP packets on a switch port that configures a cisco IP phone to transmit voice traffic in 802.1q frames tagged with the voice VLAN ID 221?
A . Device(config-if)# switchport access vlan 221
B . Device(config-if)# switchport trunk allowed vlan 221
C . Device(config-if)# switchport vlan voice 221
D . Device(config-if)# switchport voice vlan 221

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Answer: D