A linear programming problem has been formulated as follows: Maximize 10 X1 20 X2 + X1 2 X2 < 100 2X1 X2 100 + X10, X2>=0 Which of the following represents the optimal solution to this problem? Select one: X2 50 a. X1 50 b. X1 50 X2 10 c. X1 100 X2 50 d. X1 50 X2 0 e. X1 0 X2 50