Used Properly, Personality Tests Serve Two Purposes in the Work

Used properly, personality tests serve two purposes in the work place. Which of the following is one of those purposes?

A) personality tests help screen applicants for jobs by indicating areas of adequacy and inadequacy.
B) personality tests help to determine whether an applicant is a drug user.
C) personality tests help determine how little the business has to pay an applicant if hired.
D) personality tests allow the business to usefully place applicants into a relatively small number of categories in terms of personality types and character traits.