【单项选择题】
Refer to the wxhibit . what QOS model should be used to reserve the requested bandwidth and delay needed for each allowed VOIP call regardless of changing networkconditions？（）<br /> <img src="https://img.ppkao.com/2018-07/zhanglijun/2018072414295613398.jpg" /><p> Refer to the wxhibit . what QOS model should be used to reserve the requested bandwidth and delay needed for each allowed VOIP call regardless of changing networkconditions？（）<br /> <img src="https://img.ppkao.com/2018-07/zhanglijun/2018072414295613398.jpg" /></p>
A、A.best-effort delivery
B、B.ingress committed rate （ICR）
C、C.shaping and policing
D、D.egress committed rate （ECR）
E、E.integrated Services （IntServ）
F、F.differentiated services （DiffServ）
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