Among the employees of a software company, there are three Cantonese, one Beijing, and three northerners. Four people are only responsible for software development, and two people are only responsible for product sales. If the above description involves all employees of the company, the employees of the company:. ['The minimum may be 7 people, and the maximum may be 12 people.', 'The minimum may be 7 people, and the maximum may be 13 people.', 'The minimum may be 6 people, and the maximum may be 12 people.', 'May be at least 6 people, and maybe up to 13 people.']