How does the Gini coefficient measure inequality?
A. Cumulatively measuring inequality on a scale from 0 (perfect equality) to 1 (perfect inequality)
B. Dividing the total number of incomes into bands of five or ten and calculating the share of income going to each band
C. Dividing the number of incomes into percentiles and comparing selected bands
D. Comparing the average income in each country and dividing the countries into bands