Which of the following statements about subjective well-being across cultures is true?
a) The more a country deters crime through severe punishments, the happier its citizens will be.
b) The magnitude of the Gross Domestic Product (GDP) directly correlates with the level of subjective well-being.
c) Social support and community engagement have no impact on subjective well-being.
d) Subjective well-being is solely determined by individual income levels.