What are three problems with the tail drop mechanism of managing interface congestion？（）

• A、Queuing introduces equal delays for packets of the same flow， resulting in jitter.
• B、When congestion occurs， dropping affects most of the TCP sessions， which simultaneously back off and then restart again.
• C、All buffers can temporarily be seized by aggressive flows， and normal TCP flows experience buffer starvation.
• D、There is no differentiated drop mechanism. Higher priority traffic is dropped in the same way as best-effort traffic.
• E、In TCP starvation， traffic exceeds the queue limit because of the bursty nature of packet networks. A router cannot handle multiple concurrent TCP sessions.
• F、Global synchronization occurs because multiple TCP hosts reduce their transmission rates at random intervals in response to packet dropping