Regarding commercial jetliners in the United States, which of the following is true?

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They are brought into the country but not sent abroadThey are sent abroad but not brought into the countryThey are both brought into and sent out of the countryThey are neither brought into nor sent out of the country

Explanation

Commercial jetliners in the United States are involved in both import and export activities. This means they are both brought into the country from abroad and sent out to other countries.