Which two actions are performed by the Weighted Random Early Detection mechanism? (Choose two)

Which two actions are performed by the Weighted Random Early Detection mechanism? (Choose two)
A . It drops lower-priority packets before it drops higher-priority packets
B . It can identify different flows with a high level of granularity
C . It guarantees the delivery of high-priority packets
D . It can mitigate congestion by preventing the queue from filling up
E . IT supports protocol discovery

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Answer: AD