Consider the picture . Assuming TCP Reno is the protocol experiencing the behavior shown above, answer the following questions. In all cases, you should provide a short discussion justifying your answer. 45 40 35 30 25 Congestion window size (segments) 20- 15 10 5 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Transmission round a. Identify the intervals of time when TCP slow start is operating. (2marks) b. Identify the intervals of time when TCP congestion avoidance is operating. (2marks) c. What is the value of ssthresh at the 18th transmission round? (2marks) d. Again suppose TCP Tahoe is used, and there is a timeout event at 22nd round. How many packets have been sent out from 17th round till 22nd round, inclusive?(4marks)