1) (25 points) Suppose two hosts A and B are separated by the distance d = 3,000 kilo- meters and are connected by a direct link with transmission bit rate R = 100 Mbps. The link has a propagation speed of s = 2.5 . 108 meters/second. a) Evaluate the propagation delay tprop b) What is the bandwidth-delay product R.tprop? c) Evaluate the end-to-end delay (transmission delay plus propagation delay) for trans- mitting a file with F= 2,000,000 bits from A to B. d) During the transmission considered in c) what is the maximum number of bits in the link? e) What is the width of a bit on the link? f) Now suppose you can vary the transmission bit rate R. How do you need to set R such that the last bit leaves the source exactly when the first bit reaches the destination? Suppose that file size F = 2,000,000 bits, propagation speed s = 25-108 m/sec, and distance d= 3,000 km are unchanged