Concept:An organizational chart is a visual diagram that shows the internal structure of a company through its job positions and reporting relationships.Explanation:It arranges staff from the highest management level down to the lowest operational level.It clearly indicates each person’s role, rank, and the chain of command.It also shows which employees report to which managers and the flow of authority.Thus, it is used to represent the levels of staff within the company.Answer:D. hierarchy of staff in the company