In a hostile environment harassment claim, in order to hold the company liable for a violation of Title VII, when does the plaintiff NOT have to allege or prove that the employer knew or reasonably should have known about the harassment? Group of answer choices When the harasser is a co-worker and it occurred right in front of management When the harasser is a client and the plaintiff has filed a complaint with HR When the harasser is a co-worker and it is physical not mental in nature When the harasser is a supervisor/manager/someone higher up on the chain of command When the harasser is a supervisor/manager/someone higher up on the chain of command and there has been some tangible adverse employment action (e.g., bad work assignments, demotion, discipline, firing)