Refer to the exhibit. Based upon the information that is given，  how will voice traffic from the phone  and data traffic from the PC be handled by SW_1？ （）

• A、The switch port will perform marking for the ingress voice and data traffic by using the  defaultCoS value at the switch port.
• B、The switch port will trust theCoS value of the ingress voice and data traffic that comes into the  switch port.
• C、The switch port will trust theCoS value of the ingress voice traffic. Data traffic will be marked at  the switch port with the default CoS value.
• D、The switch port will trust theCoS value of the ingress data traffic. Voice traffic will be marked at  the switch port with the default CoS value.