Irene the Intelligence Analyst' is using the indicator tracking method and wants to 'operationalize' the indicator of a country's wealth. How could Irene the Intelligence Analyst best achieve this operationalization? She could operationalize a country's wealth by measuring the country's crime rate. She could operationalize a country's wealth by measuring how many people live in the country. She could operationalize a country's wealth by measuring the income level of people living in the country. She could operationalize a country's wealth by measuring the number of charity organizations in the country