3.[15 pts.] Suppose A, B, C all make their first carrier sense, as part of an attempt to transmit, while a fourth D is transmitting. Draw a time line showing one possible sequence o transmissions attempts, collisions and exponential backoff choices. Your time h also meet the following criteria a. Initial transmission attempts should be in the order A.B.C but successful transmission should be in the order of C, B, A There should be at minimum number of collisions b. . [10 pts.JThe bipolar-AMI waveform representing the binary sequence 0100101011 is transmitted over a noisy channel. The received waveform is shown below. It contains a single error. Locate the position of this error and explain your answer A recei ved bipolar-AMI waveform Fig. 1: AMI waveform [15 pts.JConsider with round trip delay RTT-45ms, each frame size is of 2KB. a two hosts connected by a channel with transmission rate R- 1.5Mbps Ifthe Stop and Wait protocol is adopted, what is the channel utilization? Suppose you are designing a sliding window protocol, please calculate the window size. What is the minimum number of bits needed for the sequence number? a b. c