$6.$ Suppose there is a $10$ Mbps 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 s$=2\mathrm{.}410^8$meters $/$ sec$.$ a$.$ What is the propagation delay of the link? b$.$ What is the bandwidth$-$delay product, R $$ d$\_$prop $?$ c$.$ Let x denote the size of the photo. What is the minimum value of x for the microwave link to be continuously transmitting?