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(a) Explain the following with application by giving the examples in your own words. i. Write the objectives of operational research? ii. Write the phases of operational research? iii. Write the drawbacks of operational research? (b)A farmer has 120 acres of land available to raise two crops, A and B. It takes one day to trim an acre of crop A and three days to trim an acre of crop B. and there are 240 days per year available for trimming. It takes 0.5 day to pick an acre of crop A and 0.2 day to pick an acre of crop B, and there are 30 days per year available for picking. Find the number of acres of each fruit that should be planted to maximize profit, assuming that the profit is $140 per acre for crop A and $235 per acre for crop B. Find the optimal profit by using graphical method