[单选] Which statement is true about the Call Admission Control （CAC） feature in VoIP networks？（）

A . CAC is used to allocate enough bandwidth for the number of calls that are allowed on the VoIP network.
B . CAC is used to protect the quality of the voice calls by preventing call establishment if enough resources are not available on the network.
C . CAC provides queuing mechanisms for voice calls if the packets exceed the configured or budgeted rate.
D . In a VoIP network the CAC can be replaced with the LLQ QoS mechanism if it has been properly implemented.

下述概念哪项是错误的（）抗HEV阳性可诊断为戊型肝炎病毒感染。抗HBe是保护性抗体。抗HAV-IgM阳性可诊断为急性甲型肝炎。 HCV-RNA阳性时可诊断为丙型肝炎病毒感染。 HBsAg和HDAg均阳性可诊断为丁型肝炎和乙型肝炎病毒重叠感染。 “新颖性”与“奇特性”是定义“创造力”的两个必要维度，两者缺一不可。 “近视”本义指看不清远处的东西，派生义指目光短浅，词义派生方式是（）。在行业竞争中，处于主导地位的企业采取垄断各种可行的技术专利的做法，这属（）战略。进攻。维持。袭击。收获。 An OSPF link can be in multiple states at any given moment （ie. Exstart， exchange， full）. Whichtwo IOS commands let you view the state of the link？（） show ip ospf。 show ip protocols。 show ip ospf neighbor。 show ip ospf interface。 Which statement is true about the Call Admission Control （CAC） feature in VoIP networks？（）

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[单选] Which statement is true about the Call Admission Control （CAC） feature in VoIP networks？（）

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