Suppose we formulate a LP as follows. Maximize profit = 10X 1 + 20X 2 Subject to 5X1 + 4X2 s 2000 X1 2 80 X1 + X2 2300 X2 2 100 Applying the corner point method to solve this LP, we find four corner points, They are A(80,220), B(80,400), C(320,100), D(200,100). What is the optimal solution? A(80,220) B(80,400) C(310,100) D(200,100)