对于我司ZXCTN设备的QOS，以下控制流程排序正确的是： For QoS of ZXCTN equipment, which of the following control flows is correct?

【单选题】
A 1、业务分类-----流量监管------拥塞控制------队列调度 classification of traffic-----traffic policing------congestion control------queue scheduling
B 2、流量监管-----拥塞控制-----队列调度------业务分类 traffic policing------congestion control------queue scheduling-----classification of traffic
C 3、拥塞控制-----队列调度-----业务分类-----流量监管congestion control------queue scheduling------classification of traffic-----traffic policing
D 4、业务分类-----队列调度------拥塞控制------流量监管 classification of traffic-----queue scheduling------congestion control------traffic policing

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