According to Henri Fayol's Fourteen Principles of Management,which of the Following

According to Henri Fayol's fourteen principles of management,which of the following is true of unity of direction? 

A)  ​All employees should report to and receive orders from just one boss. 
B)  ​Employees must put the organization's interests and goals before their own. 
C)  ​There should be no overlapping responsibilities for the employees in an organization. 
D)  ​One person and one plan should be used in deciding the activities to be carried out.