Which of the following statements is true of Leadership Era $4?$

Select one:

a$.$ This is the era of Great Man leadership and the emphasis on personal traits of leaders.

b$.$ This era may be conceptualized as pre$-$industrial and prebureaucratic.

c$.$ This era sees the rise of the "rational manager" who directs and controls others using an impersonal approach.

$$ d$.$ This era requires the full scope of leadership that goes beyond rational management or team leadership.