With Regard to Polygraph Tests

With regard to polygraph tests,

A) public and private employers may require that employees take no more than one test per year as a condition of employment.
B) an employer may require mandatory tests only if every employee, both management and nonmanagement, is required to be tested.
C) government employees may be required to take tests only if the tests are a part of an investigation for theft or economic loss.
D) a privately owned drug company may require tests of its employees.