Graph the function f(x) over the given interval. Partition the interval into four subintervals of equal length. Then add to your sketch the rectangles associated with the Riemann sum f(ck) Axk given that C the (a) left endpoint, (b) right endpoint, and (c) midpoint of the kth subinterval. (Make a separate sketch for each set of rectangles.) k=1 f(x) = sin x, 4 a. Sketch the rectangles associated with the Riemann sum f(CK) Axk given that c is the left endpoint of the kth subinterval. Choose the correct graph below. k=1 OA. -N O E. O B. O F. Ay Q 2 Ay Q G C. G. E O D. Ay O H. G is