graphical methods to solve the linear programming problem mimize z=2x+4y subject to x+2y2 10, 3x+y210, x20, and y20 OA. Minimum of 0 when x=0 and y=0 OB. Minimum of 20 when x 2 and y=4, as well as when x=10 am and all points in between OC. Minimum of 20 when x 10 and y=0 OD. Minimum of 20 when x=2 and y=4