Final answer:
Assertiveness and silent authority are influence tactics that rely on the power of a leader's formal position or authority.
Step-by-step explanation:
The correct answer is A. legitimate power. Assertiveness and silent authority are influence tactics that rely on the power of a leader's formal position and authority.
Legitimate power is derived from the leader's role or position in an organization, and it is the authority that is granted to them by virtue of their position. It is based on the belief that the leader has the right to tell others what to do.