The correct answer is: All of the above.
The Human Development Index (HDI) is a composite statistic of life expectancy, education, and per capita income indicators, which are used to rank countries into four tiers of human development. A country scores higher on the HDI if it has a high life expectancy, high education attainment, and high per capita income.
Per capita income is a measure of a country’s economic output per person. It is calculated by dividing a country’s gross national income (GNI) by its population. GNI is the total value of all goods and services produced in a country in a year.
Literacy rate is the percentage of people aged 15 and above who can read and write. It is a measure of a country’s educational attainment.
Life expectancy at birth is the average number of years that a person is expected to live if they were born in a particular year. It is a measure of a country’s health care system.
The HDI was developed by the United Nations Development Programme (UNDP) in 1990. It is used to measure the level of human development in a country and to track progress over time. The HDI is a valuable tool for policymakers and researchers, as it provides a comprehensive measure of human development.