Solve the following FOUR variable linear program using Excel. (You cannot solve this problem easily with the graphical method). MAXIMIZE 2X1 + 5X2 + 3X3 +7X4; subject to the constraints: X1 + X2 + X3 + X4 <= 10; 2X1 + 3X2 + 1X3 + 6X4 <= 17; X1 >= 0; X2 >= 0, X3>= 0, X4 >= 0. The optimal solution value for this linear program is:

• A.The optimal solution value is 17.
• B.The optimal solution value is 15.
• C.The optimal solution value is 37.
• D.The optimal solution value is 19.