From the measurement tools below, circle the one that will help you measure the delay between two hosts. A. traceroute B. nslookup C. nmap D. whois Recall the tit-for-tat incentive principle used by BitTorrent. Consider the eight peers depicted in the diagram below and their interaction with an unchoker whose upload speed is 40Mbps. Answer the following questions. Round t (peers uploading to unchoker) UNCHOKER (u=40Mbps) 12285 10* 22 11 9 3 P1 P2 P3 P4 PP +50 P5 P6 P7 P8 Round t + 1 (unchoker uploading to peers) UNCHOKER (u=40Mbps) P1 P2 PPPPPP P3 P4 P5 P6 P7 P8 Round t + 2 (peers uploading to unchoker) UNCHOKER (u=40Mbps) * These numbers indicate a peer's upload speed in Mbps. Assume that a peer's upload speed remains the same across all rounds unless otherwise noted. P1 P2 P3 P4 P5 P6 UU P7 P8 A. Which peers will the unchoker upload to in round t+1? At what data rate will the unchoker upload to these peers? Draw your answer in the figure or write down the numbers of peers who will get chunks and the data rate at which these chunks will be uploaded by the unchoker.