Select all that apply Which of the following statements are true about the hiring of foreign workers by employers? (Check ALL that apply.) Multiple select question. Employers are required to retain I-9 forms of foreign employees for a maximum period of one year. If it is discovered that an employer knowingly employed undocumented immigrant workers, the legal implications are only for the undocumented workers. Employers are required to confirm "work authorization," which means that every new employee, at the time of hire, must fill out Form I-9. Employers who fail to comply with the laws regarding the hiring of foreign workers risk criminal and civil sanctions