Which two statements about the best effort model for QoS are true？（）A、delay sensitive packets are given preferential treatmentB、the default policy identifies a delay sensitive class and default classC、the default policy identifies a delay sensitive class，

题目

Which two statements about the best effort model for QoS are true？（）

A、delay sensitive packets are given preferential treatment
B、the default policy identifies a delay sensitive class and default class
C、the default policy identifies a delay sensitive class， best effort class， and default class
D、the model is highly scalable
E、the model is still predominant on the internet F the model provides guaranteed service

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