Which of the following statements about traffic shaping are correct?

A、The aim of traffic shaping is to send traffics at an even speed;
B、Traffic shaping can be implemented on point-to-point connection via leak bucket algorithm;
C、Leak Bucket used in leak bucket algorithm of traffic shaping is a buffer in fact, where packets to be sent are deposited there;
D、Token Bucket used in token bucket algorithm of traffic shaping
is a buffer in fact, where packets to be sent are deposited there.