Suppose A, B, and C all make their first carrier sense, as part of an attempt to transmit, while a fourth station D is transmitting. Draw a timeline showing one possible sequence of transmissions, attempts, collisions, and exponential backoff choices. Your timeline should also meet the following criteria: (i) initial transmission attempts should be all stations at the same time but successful transmissions should be in the order C, B, A, and (ii) there should be at least four collisions. Specifically mention the backoff choices of each station.