1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Problem 2 A manufacturer has three plants with access production capacity. It can use this capacity to produce a product that comes in three sizes, Large, Medium, and Small. Any plant can produce any combination of the product sizes. The manufacturer wants to determine how many units to produce in each plant of each product size. The decision variables to solove for are therefore: Plant 1 Plant2 Plant3 Large X11 X12 X13 X23 X33 Medium X21 X22 Small X31 X32 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 1. The forecast of sales for each product size is known to be 900, 1200, 750 units for the Large, Medium and Small products respectively, so production levels should not exceed these values. Which option describe these conditions properly? a. X11+X12+X13+X21+...+X33