$13.$ The main difference between the Ohio State$/$Michigan Studies and Contingency Theories of Leadership is that

a$.$ Contingency theories of leadership mainly focus on identifying one best way to manage.

b$.$ The Ohio State$/$Michigan Studies take into account situational! characteristics in identifying effective leadership behaviors.

c$.$ The Ohio State$/$Michigan Studies focus mainly on employee$-$centered leader behavior whereas Contingency Theories of Leadership focus primarily on task$-$oriented behaviors.

d$.$ None of the above.