Select one:
a. It is illegal for employers to discriminate against non-citizens because "national origin" is a protected category.
b. An interviewer cannot ask an applicant if he or she is authorized to work in the United States.
c. Once hired, an employer chooses three forms of evidence that the applicant must provide proving he or she is authorized to work in the United States.
d. Once hired, employers must turn I-9 records over to the immigration office.