Use a Riemann sum to approximate the area under the In which graph below are the selected points the graph of f(x) (shown below) on the interval 1 sx $ 5 left end points of the 4 approximationg using n = 4 subintervals with the selected points as the rectangles? left end points. Draw the approximationg rectangles O A. O B. Ay Ay Ay 8- 8 8- 6-1 6- ONA X X 0-7 02468 02468 O C. OD. X 2 Ay Ay 6- X 02468 02468 Using the specified rectangles, approximate the area