Which of the following statements is true of quid pro quo harassment?

a$.$

A supervisor or coworker can be held guilty of quid pro quo harassment for telling jokes that are suggestive or sexual in nature.

b$.$

A supervisor or coworker can be held guilty of quid pro quo harassment for repeatedly coercing his or her subordinates to stay late after work.

c$.$

A company always bears liability for quid pro quo harassment because supervisors are agents of the company.

d$.$

A plaintiff only needs to show that a company's working conditions are hostile to prove charges of quid pro quo harassment.