Final answer:
In agency law, a contract completed by an agent is considered a contract of the principal.
Step-by-step explanation:
The correct option from the given choices (OC) A contract completed by an agent is NOT a contract of the principal is NOT a key principle in agency law. In agency law, a contract completed by an agent is considered a contract of the principal. This means that the principal is bound by the agreements made by the agent on their behalf.
Learn more about Key principles in agency law