A company recruits a business manager, Xiao Zhang and Xiao Li come to apply. Xiao Zhang said: "If I become a business manager, I will be aggressive and develop new business. " Xiao Li said: "If I become a manager, I will Optimize management and reduce staff. "In the end, one of them became a business manager and successfully realized his job proposition. It follows that the following statements must be true:. ['The company has not only opened up new business, but has also reduced staff.', 'If the company develops a new business, it must be Xiao Zhang who has become a business manager.', 'If the company has reduced staff, it must be Xiao Li who has become a business manager.', 'If the company does not start a new business, it will definitely reduce staff.']