What is Gross National Happiness and which country measures it?Group of answer choicesGross National Happiness is a measurement of the happiness level of the leaders of a country. It is currently measured by Bhutan.Gross National Happiness is a measurement of the happiness level of the citizens. It is currently measured by Bhutan.Gross National Happiness is a measurement of the happiness level of the citizens. It is currently measured by DenmarkGross National Happiness is a measurement of the average income in a country as compared to the percentage of married couples.