Which of the Following Statements Is True of Polygraph Tests

Which of the following statements is true of polygraph tests?

A) They are legally used by most private employers to screen job applicants.
B) They may be legally used by most private employers to randomly check current employees.
C) They may be legally used by private companies that sell controlled substances to test both job applicants and current employees.
D) They are used when senior employees are being transferred to a different department within a firm.
E) They are generally not used by public employers for screening job applicants.