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(1 point) (a) Estimate the area under the graph of f (x) = 4 + x2 from x = 1 to x = 2 using three approximating rectangles and right endpoints. R3=[17 ] (b) Repeat part (a) using six approximating rectangles and right endpoints. Rs (0) Repeat part (a) using three approximating rectangles and left endpoints. L3=i14 i (d) Repeat part (a) using six approximating rectangles and left endpoints. L6: [115/4 l (e) Repeat part (a) using three approximating rectangles and midpoints. M3 = 14.75 (1') Repeat part (a) using six approximating rectangles and midpoints. Ms=l l Based on sketches of the graph of f (x) and the approximating rectangles, which appears to be the best estimate? "' A. L6 a 3. M6 ,_\\ '3' R6 fix D. R3 fix E. M 3 '7' F. L3