Gross Domestic Product (GDP) is defined as:

Gross Domestic Product (GDP) is a measure of economic activity that represents the total value of all goods and services produced within a country’s borders over a specific time period, typically annually or quarterly. This encompasses all economic output generated by the country's residents and businesses, regardless of whether they are domestic or foreign-owned, as long as the production occurs within the country's territory.

This definition emphasizes that GDP is focused solely on production within a country's geographical boundaries, which makes it a critical indicator for assessing the economic performance of that nation. It's a comprehensive measure that helps economists and policymakers understand the overall health of the economy and compare different economies.

Considering the other choices, the total value of imports and exports pertains to trade balance rather than domestic production, the amount of money the government collects in taxes addresses government revenue, and the national budget allocation refers to planned government spending rather than economic output. Each of these concepts plays a role in understanding a country's economic framework but does not align with the specific definition of GDP.