Economics Question: What is the significance of the Gross Domestic Product $($GDP$)$ in measuring the economic performance of a country, and how is it calculated? A$)$ GDP measures only the government's contribution to the economy and is calculated by summing government expenditures. B$)$ GDP is a comprehensive measure of a country's economic activity and is calculated by adding up consumption, investment, government spending, and net exports. C$)$ GDP solely considers consumer spending and is calculated by totaling household expenditures. D$)$ GDP is an unreliable measure of economic performance and is calculated by adding up the monetary value of all assets in a country.

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