Which statement about traffic policing and which statement about traffic shaping are true? (Choose two)

Which statement about traffic policing and which statement about traffic shaping are true? (Choose two)

A.
A need for traffic shaping occurs when a service provider must rate-limit the customer traffic to T1 speed on an OC-3 connection.

B.
Traffic policing and traffic shaping conditioning are mechanisms that are used in an edge network to guarantee QoS.

C.
Traffic policing can cause UDP retransmissions when traffic in excess of specified limits is dropped.

D.
Traffic policing drops excess traffic in order to control traffic flow within specified rate limits.

E.
Traffic shaping buffers excess traffic so that the traffic stays within the desired rate.