Q$[5]$ Suppose two hosts, A and B$,$ are separated by $20,000$ kilometers and are connected by a direct link of R$=2$ Mbps$.$ Suppose the propagation speed over the link is $2\mathrm{.}5108$ meters$/$sec$.$ a$.$Calculate the bandwidth$-$delay product, R dprop.b$.$Consider sending a file of $800,000$ bits from Host A to Host B$.$ Suppose the file is sent continuously as one large message. What is the maximum number of bits that will be in the link at any given time?c$.$Provide an interpretation of the bandwidth$-$delay product.d$.$ What is the width $($in meters$)$ of a bit in the link? Is it longer than a $$football field?e$.$Derive a general expression for the width of a bit in terms of the propagation speed s$,$ the transmission rate R$,$ and the length of the link m$.$