Which two statements about configuring a voice VLAN on a switch port are true? (Choose two.)

Which two statements about configuring a voice VLAN on a switch port are true? (Choose two.)
A . The port must be operating in untrusted mode.
B . Tagged traffic is not supported.
C . It must be configured separately from the VLAN that carries data traffic
D . If the port is trusted, data traffic that passes through the Cisco IP Phone maintains its QoS values.
E . The port must be operating in trusted mode.
F . Cisco Discovery Protocol must be disabled on the switch port.

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Answer: CD