Manager Inventory Chart, also known as replacement chart, is used in Replacement Planning of human resource management in an organization. Which of the following is not an advantage of Manager Inventory Chart?

(a) It gives an overview of the human resource situation of an organization

(b) It shows the future internal supply of managers by indicating who is promotable in a year

(c) It shows the position to which a manager may be promoted

(d) Managers who are ready for promotion can be easily identified