A manager of a nursing home wants to be sure not to employ any immigrants who aren't authorized to work in the United States. The manager proposes that the company consider only job applicants who are obviously citizens. What is the legal problem with this idea?
A. It is a violation of the WARN Act, which protects against discrimination
B. It violates the principle of employment at will.
C. It eliminates the need for requiring the Form I-9 verification process.
D. It may lead to discrimination on the basis of race and national origin​