16K 10K 8K A Window Size B D F th E Time 1) The window size of the TCP sender decreases at several points in the graph, including those marked by B and D. a) Name the event occurred at B that causes the sender to decrease its window. Triple duplicate ACK b) "At event B, the network is fully congested, and it cannot deliver any packet to the receiver". Is the previous statement "True" or "False"? If it is "False", change any wording to make the statement correct. Justify your answer. c) Name the event occurred at D that causes the sender to decrease its window. TimeOut d) "At event D, the network is fully congested, and it cannot deliver any packet to the receiver". Is the previous statement "True" or "False"? If it is "False", change any wording to make the statement correct. Justify your answer.