P$29.$ Suppose there is a $10Mbps$ microwave link between a geostationary satellite and its base station on Earth. Every minute the satellite takes a digital photo and sends it to the base station. Assume a propagation speed of $2\mathrm{.}4*108$ meters$/$sec$.$

a$.$ What is the propagation delay of the link?

b$.$ What is the bandwidth$-$delay product, $R*$ dprop?

c$.$ Let $x$ denote the size of the photo. What is the minimum value of $x$ for the microwave link to be continuously transmitting?