#3 only A and D please

#3 (25 points) a) What is GoS? (5 points) b) A city of 882 sq. miles area uses 21 sq. mile cells with 7-cell clusters. How many cells the city is divided in? (5 points) c) How many clusters are operating in the city? (5 points) d) The city is allotted a total of 850 channels for voice/data calls. How many channels are available in each cell? (5 points) e) Find the number of mobile users (capacity) that can be supported in the city. (5 points)