Q 4: The Transmission Control Protocol uses a method called congestion control to regulate the traffic entering the network. The behavior of TCP congestion control can be represented as a graph in which the x-axis indicates the time, and the y-axis indicates congestion window size. Please use the graph shown below to the answer the following questions. Note that the graph does not explicitly show timeouts, but you should be able to figure out when timeouts happened based on the events shown DCCN-BCS-4C/4D 06/01/2021 35 30 25 20 Congestion Window Size (Segments) br 15 10 5 0 Transmission Round (a) Slow Start: give two reasons why slow start is used, and explain why it does a better job than congestion avoidance for that function. (1) (b) Slow Start: identify the intervals of time when TCP slow start is operating. For each interval, identify which of the above reasons apply and do not apply and explain why? (2) (c) Congestion Avoidance: identify the intervals of time when TCP congestion avoidance is operating. Why should congestion avoidance be used instead of slow start during these intervals? Please clearly identify one specific reason. (2)