What does the interface subcommand switchport voice vlan 222 indicate?

A.
The port is configured for both data and voice traffic.

B.
The port is fully dedicated to forwarding voice traffic.

C.
The port operates as an FXS telephony port.

D.
Voice traffic is directed to VLAN 222.

Explanation:
The interface subcommand:
Switch(config-if)# switchport voice vlan {vlan-id | dot1p | untagged | none}
is used to select the voice VLAN mode that will be used when PC is connected to the switch port
through Cisco IP phone.
Reference:
http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_20_se/configur
ation/guide/swvoip.html