After constructing a relative frequency distribution summarizing IQ scores of college students, what should be the sum of the relative frequencies? Choose the correct answer below. -:':j:- A. If percentages are used, the sum should be 100%. If proportions are used, the sum should be 1. If percentages are used, the sum should be 0%. If proportions are used, the sum should be 0. If percentages are used, the sum should be 100%. If proportions are used, the sum should be 100. PS7!\" If percentages are used, the sum should be 1%. If proportions are used, the sum should be 100