【单选题】
Refer to the exhibit.<br /> <img src="https://nimg.ppkao.com/2018-07/gelingxia/2018073015554566566.jpg?sign=b670ccc393f952e74d781811304ddb80&t=62d0d5e9" /><br /> Which of the following should you do to configure the IP phone to override the priority of the data packets it receives from the host？ （）
A、 Issue the mls qos trust cos command on the switch port connected to the IP phone.
B、 Issue the switchport priority extend cos command on the switch port connected to the IP phone.
C、 Issue the switchport priority extend cos command on the IP phone.
D、 Issue the mls qos trust cos command on the IP phone.
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