(1 point) On a sketch of y = ex, represent the left Riemann sum with n = 2 approximating 2 e* dx. Write out the terms of the sum, but do not evaluate it: Sum = On another sketch, represent the right Riemann sum with n = 2 approximating e* dx. Write out the terms of the sum, but do not evaluate it: Sum = Which sum is an overestimate? A. the left Riemann sum B. the right Riemann sum C. neither sum Which sum is an underestimate? A. the left Riemann sum B. the right Riemann sum C. neither sum