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After constructing a relative frequency distribution summarizing IQ scores of college​ students, what should be the sum of the relative​ frequencies?

a. If percentages are used, the sum should 1%. If proportions are used, the sum should be 100.
b. If percentages are​ used, the sum should be​ 0%.  If proportions are​ used, the sum should be 0.
c. If percentages are​ used, the sum should be​ 100%.  If proportions are​ used, the sum should be 1.
d. If percentages are​ used, the sum should be​ 100%.  If proportions are​ used, the sum should be 100.