Final answer:
Competitive Power is not one of the four primary sources of power for effective leaders, which are Legitimate Power, Expert Power, Coercive Power, and Referent Power.
Step-by-step explanation:
The option that is NOT one of the four primary sources of power for effective leaders is d) Competitive Power. The commonly recognized four bases of power for leaders, as defined by French and Raven's social power theory, are a) Legitimate Power, which is derived from a position of authority within an organization; b) Expert Power, which comes from a leader's expertise or skill; c) Coercive Power, which is the ability to punish or control; and Referent Power (not listed in the choices), which arises from the leader's ability to build strong relationships. Competitive Power is not typically listed among these sources of power.