单选题Which of the characteristics below is associated with the （QoS） Integrated Services Model？（）AQoS classified at layer 3 using IP precedence or DSCPBGuaranteed rate serviceCImplemented using FIFO queuesDAll traffic has an equal chance of being dropped
单选题
Which of the characteristics below is associated with the （QoS） Integrated Services Model？（）
A
QoS classified at layer 3 using IP precedence or DSCP
B
Guaranteed rate service
C
Implemented using FIFO queues
D
All traffic has an equal chance of being dropped
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