Regarding an Employer's Vicarious Liability for Harassment, Which of the Following

Regarding an employer's vicarious liability for harassment, which of the following statements is true?

A) the employer automatically has an affirmative defense to vicarious liability when a hostile environment is created by a top official
B) the employer automatically has an affirmative defense to vicarious liability when harassment by a coworker occurs
C) a supervisor creates a hostile environment and the employer does not have a sexual harassment policy or complaint reporting procedure
D) the employer is automatically vicariously liable when a top official takes an adverse employment action against the employee