What is the primary indicator used by the World Bank to classify countries as high-income, middle-income, or low-income?
ATotal Gross Domestic Product (GDP)
BHuman Development Index (HDI)
CLiteracy Rate
DPer capita income (GNI per capita)
ATotal Gross Domestic Product (GDP)
BHuman Development Index (HDI)
CLiteracy Rate
DPer capita income (GNI per capita)
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