Refer to the exhibit. Which switch interface configuration command would automatically configure quality of service （QoS） for voice over IP （VoIP） within a QoS domain？ （） 
- A、switchport priority extend trust
- B、mls qos trust
- C、switchport priority extend cos 7
- D、auto qos voip cisco-phone
正确答案:D
答案解析:有
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