Concept:An agency contract is a legal agreement that creates the principal-agent relationship.Explanation:The principal is the person who gives authority to another to act on their behalf.The agent is the person legally appointed to carry out actions for the principal.The contract is formed directly between the principal and the agent, not with a consumer, producer, or third party.The agent must act in the principal’s interest and avoid conflicts of interest.Answer:D. a principal and an agent