Which two statements are true about traffic shaping and traffic policing？（）

• A、both traffic shaping and traffic policing cause retransmissions of connection-oriented protocols such as TCP
• B、both traffic shaping and traffic policing support the marking and re-marking of traffic
• C、the effects of traffic shaping and traffic policing when configured on a router are applied to outgoing traffic
• D、traffic shaping queues excess traffic whereas traffic policing discards excess traffic
• E、traffic shaping allows the traffic to exceed the bit rate whereas traffic policing prevents the traffic from exceeding the bit rate