1) In 2009, a disgruntled customer of a South African broadband service provider set up a race that pitted a carrier pigeon against the company's DSL service (this is a true story). The carrier pigeon (named Winston), was able to carry a 4GB data stick 60 miles in two hours, 13 minutes and 20 seconds (i.e., 8000 seconds). During that time, 4% of the 4Gbyte file had been transmitted (this is a true story, reported, among other places, on Gizmodo on 10 Sept 2009, with the numbers altered a bit). a) What was the throughput of the "channel" provided by the Winston? b) What was the throughput of the DSL line? c) Does it make sense to differentiate transmission time and propagation time in this "channel"? Why or why not? d) Suppose that you had more than 4GByte of data to send and could only afford one memory stick but you had plenty of pigeons available (Winston's extended family). You reason that you can send the data stick back, load it with the next 4GByte of data. What would the throughput of this channel be now?