Which of the following is true about avoiding discrimination?
a. If the four-fifths rule is satisfied, substantial evidence of discrimination exists.
b. Proving disparate impact in court requires showing an employer's intent.
c. A bona fide occupational qualification is a merely preferred qualification for performing a job.
d. Reasonable accommodation is provided subject to the condition of undue hardship.
e. Proving disparate treatment in court does not require the plaintiff showing an employer's intent.