According to the World Bank, how are countries categorized based on their GNP per capita?

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Newly Industrialized Countries, OPEC members, and G7 nationsLow-income, middle-income, and high-income countriesSoutheastern, Northeastern, and Southwestern regionsContinents such as Asia, America, and Europe

Explanation

The World Bank classifies countries into three groups based on their gross national product (GNP) per capita: low-income, middle-income, and high-income. Other groupings like NIC, OPEC, and G7 refer to different classifications, while geographic divisions such as continents or regions are unrelated to income-based categorization.