The one that is not a non-tariff barrier is option D. ad-valorem duties
Tariff barriers refers to a barrier to trade between particular countries or specific areas involving nations which occurs in the form of abnormally excessive taxes levied by a government on imports or occasionally exports for purposes of protection, support of the balance of payments, or the raising of revenue.
Tariff barriers is also considered to be several tariffs or duties imposed on foreign trade transactions to impose trade restrictions. From the available options, ad-valorem duty is tariff barrier, while the others are non-tariff barriers to trade.
Ad-valorem duty is imposed on import goods as percentage of the total value of goods imported.
Therefore, the correct answer is as given above
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