One of the Key Differences Between Zaleznik's and Kelley's Approach

One of the key differences between Zaleznik's and Kelley's approach to followership is ______.

A) Zaleznik's typology includes six types of followers while Kelley's includes four types
B) Zaleznik wanted to explain the dynamics of conflicts while Kelley was highlighting followers' importance
C) Zaleznik's typology included and active/passive dimension while Kelley's did not
D) Zeleznik's typology discredited Kelley's prior work