Consider the diet problem summarized in the following table. In this table, different food items available in a Mac Donalds restaurant are displayed in column A. Column B contains the selling prices of these food items (in dollars), and columns C, D, E and F contain their calories, protein contents (in grams), fat contents (in grams) and sodium contents (in milligrams) respectively. Columns G, H, I, J, K, L and M display various vitamin and mineral contents of the said food items (in % of Required Daily Allowances - RDA). Given that a "healthy" daily diet must contain, i) at least 55 grams of protein; ii) at most 3000 milligrams of sodium; iii) at least 100% RDA of vitamin A; iv) at least 100%RDA of vitamin C; v) at least 100% RDA of vitamin B1; vi) at least 100% RDA of vitamin B2; vii) at least 100% RDA of Niacin; viii) at least 100% RDA of Calcium; ix) at least 100% RDA of Iron: x) no more than 30% of all calories should come from fat ( 1 gram of fat contains 9 calories); which food items (and how many) should be selected for daily consumption, in order to optimize various objectives, while satisfying the above constraints. * This problem is based on the article "Big Mac Attack Revisited", by E. Erkut, which appeared in OR/MS Today, pp. 50-52, June 1994. 4. Comment on how to achieve variety maximization (instead of cost minimization)