Cincinnati is considering a complete redesign of where its fire stations are located. There are 9 locations being considered for the fire station locations. Each location covers a certain area of Cincinnati (labeled A through J). I need your assistance in completing this by using the Excel file Problem 3 to develop a set-cover optimization model that will determine the minimum number of fire stations and their locations to cover all the areas (A through J). What is the minimum number of fire stations that Cincinnati will have to build to cover all areas A through J?