Which of These Is TRUE of Workplace Strategies Around Drug

Which of these is TRUE of workplace strategies around drug treatment and prevention?

A) All employers are legally required to have drug-free workplaces.
B) Drug-testing in the workplace has been litigated as a challenge to employees' right to privacy.
C) Drug-free workplaces have little to no effect on the use of drugs in the workplace.
D) Peer support groups are the most common ways that employers manage drug use in the workplace.