A unit recruited 30 new employees this year.① Some of the newly recruited employees are from outside the country; ② Of the newly recruited employees, the highest academic qualifications are not foreigners; ③ Some of the newly recruited employees are not foreign. If only one of the above three judgments is true, then the following items correctly represent the number of foreign workers among the newly recruited employees in the unit. ['Only 1 person is a foreigner.', '0 employees are foreigners.', '0 employees are not foreigners.', 'Only 1 person is not a foreigner.']