Refer to Exercise 1 at the end of chapter 8 (Sky Cell ) Prepare a spreadsheet model that addresses questions a), b), & d).Correct model and optimal solution - 7 pointsExplicitly state you answer to part b 1 pointCopy and modify your model in a new worksheet to address part d - 2 points. (Hint: Simply add a constraint for max production per period and resolve).Submit your work in an excel spreadsheet.beware of following mistakes:1- That the demand given in table 8-10 is in thousands of units.2- Each worker can make 6 units per hour. Or it takes 0.167 hr/unit , each takes 10 minutes (1/6 hr)It is not necessary to include integer constraints for production and inventory. (In case when you can hire and fire, the workers, of course, should be integers. ) Adding additional integer constraints will not change your solution but in some cases, it can increase solver processing time substantially