You need to configure a new Company Catalyst 3560 switch for a VOIP-enabled office.  Which  three statements are true about the voice VLAN feature on this switch？（）

• A、The default CoS value for incoming traffic is set up to 0.
• B、The CoS value is trusted for 802.1p or 802.1q tagged traffic.
• C、PortFast is automatically disabled when a voice VLAN is configured.
• D、The voice VLAN feature is disabled by default.
• E、The IP phone accepts the priority of all tagged and untagged traffic and sets the CoS value to 4.
• F、When the voice VLAN feature is enabled， all untagged traffic is sent according to the default  CoS priority of the port