The feasible region for a linear program is defined by these three constraints: 5A + 5B S 400; -1A + 1B S 10; 1A + 3B = 90; A = 0; B 2 0. In this feasible region, the objective function (A - B) is maximized. Which of the following statements is true? O (35, 45) is the best corner point for (A-B) The feasible region has 4 corner points all of which are equally good for this objective function. The optimal objective value is 70. (15, 25) is the best corner point for this objective