Elaborate on the concepts of nominal gross national product and real gross national product with examples to illustrate the significance of these measures in economic decision-making.
a) Nominal GDP measures the total value of goods and services produced, while real GDP adjusts for inflation.
b) Nominal GDP considers only current market prices, while real GDP accounts for constant base-year prices.
c) Both nominal and real GDP provide the same economic information.
d) Nominal GDP is irrelevant in economic decision-making.