Mary in the accounting department is dealing with many work-related disputes with her manager, Nancy. It has reached to a point where Mary cannot do...

Mary in the accounting department is dealing with many work-related disputes with her manager, Nancy. It has reached to a point where Mary cannot do her job anymore. Where should Mary go to file a complaint about Nancy?

     A. Ombudsperson

 B. Arbitrator

 C. Mediator

 D. Conciliator