Final answer:
The term 'Principal' is not a type of agent authority, but refers to the entity or individual who grants authority to an agent. The types of agent authority are express, implied, and apparent.
Step-by-step explanation:
The correct answer to the question of which is NOT a type of agent authority is (c) Principal. In the context of agency law, the types of agent authority include express, implied, and apparent authority.
Express authority is when an agent has been explicitly told what they can and cannot do. Implied authority refers to the power of an agent to perform acts which are reasonably necessary to accomplish the purpose of the agency.
Apparent authority, also known as ostensible authority, exists when an agent appears to have been given authority, based on the principal's behavior, even if such authority was not explicitly or implicitly granted. 'Principal' refers to the entity or person who gives an agent authority, therefore 'principal' is not a type of agent authority.