A Spanish buyer imports computers from China and pays the appropriate tariff. It then sells the computers to a Portuguese buyer and the goods enter Portugal without tariff. The Portuguese owner then exports the computers to a distributor in Italy and again the computers cross a national a border with no tariff. In this respect, the EU is similar to a: a. Free trade zone (FTZ). b. Free trade area (FTA). c. Customs union. d. Development area