Refer to the exhibit. Which of these is applied to the Bearer class?()<img src="https://nimg.ppkao.com/2018-07/lina/201807231730019984.jpg?sign=81ef20545ed2c0748b9ef5737af7bd0b&t=62d35156" />
A、WRED
B、traffic shaping
C、packet marking
D、packet classification
E、FIFO queuing within the class