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Use sigma notation to write the following left Riemann sum. Then, evaluate the left Riemann sum using a calculator. f(x) = ex on [0, In 5] with n = 50 Write the left Riemann sum using sigma notation. Choose the correct choice below. OA. E ex . In 5 K = 1 50 In 5 - IN OB. E In 5 k = 1 In 5 Oc. C 50 In 5 K = 1 50 In 5 OD. J K-7)- 50 In 5 50 K = 1 The left Riemann sum is (Type an integer or decimal rounded to three decimal places as needed.)