Which of the following is a test that must be met to qualify for the administrative employee exemption?

a. The employee must be compensated on a salary or fee basis at a rate not less than $455 per week.

b. The employee's primary duty must be performance of manual work.

c. The employee must customarily and regularly direct the work of at least two or more other full-time employees or their equivalent.

d. The employee must have the authority to hire or fire other employees.