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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?()

A.best-effort delivery
B.ingress committed rate (ICR)
C.shaping and policing
D.egress committed rate (ECR)
E.integrated Services (IntServ)
F.differentiated services (DiffServ)

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