By Default, WRED Is Configured on a Newly Deployed Huawei

By default, WRED is configured on a newly deployed Huawei router. Which of following statements regarding WRED are true?

A) When traffic exceeds the minimum threshold, WRED starts to discard all inbound traffic (tail drop) .
B) Traffic with low bandwidth is more likely to be discarded than traffic with high bandwidth.
C) WRED selectively discards multiple TCP flows to avoid global synchronization.
D) WRED can be used to set different drop thresholds and packet loss rations for data packets with different priorities.