What best describes a tariff-rate quota?

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A two-level tariff imposed on a nation's importsA three-level tariff imposed on a imports of a countryA two-level quota applied to a country's exportsA three-level quota applied to a nation's exports

Explanation

A tariff-rate quota is a system where two different tariff rates are applied to imports: a lower tariff up to a certain quantity, and a higher tariff beyond that threshold. This mechanism regulates imports by combining quota and tariff measures.