Step 1: The Human Development Index, developed by UNDP, is a composite of three dimensions of human development.
Step 2: The three components are: (a) a long and healthy life, measured by life expectancy at birth; (b) knowledge, measured by education (mean and expected years of schooling); and (c) a decent standard of living, measured by gross national/domestic income per capita (GDP/GNI per capita).
Step 3: The health dimension uses life expectancy at birth, not life expectancy at 1 year of age. There is no HDI component based on life expectancy at 1 year.
Step 4: Hence the statement that is NOT true is option 2 (Life expectancy at 1 year of age). The correct answer is option 2.