【多项选择题】
Which two statements best describe CBWFQ？（）
A、A.The CBWFQ scheduler provides a guaranteed minimum amount of bandwidth to each class.
B、B.CBWFQ services each class queue using a strict priority scheduler.
C、C.The class-default queue only supports WFQ.
D、D.Inside a class queue， processing is always FIFO， except for the class-default queue.
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