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 trusted mode
B . Cisco Discovery Protocol must be disabled on the switch port
C . Tagged traffic is not support
D . It must be configured separately from the VLAN that carries data traffic
E . The port must be operating in untrusted mode
F . If the port is trusted, data traffic that passes through the Cisco IP Phone maintains its QoS valus

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Answer: DF