If goods are produced in a U.S. foreign trade zone, then: Group of answer choices Duty must be paid if they are sold domestically The products must be exported Duty must always be paid when materials arrive Duty is always paid when they leave the free trade zonesIf goods are produced in a U.S. foreign trade zone, then: Group of answer choices Duty must be paid if they are sold domestically The products must be exported Duty must always be paid when materials arrive Duty is always paid when they leave the free trade zones