Final answer:
The correct term for a person who hires an agent to represent their interests is 'Principal'. The principal-agent relationship is fundamental in business and legal settings where representation is necessary. The correct option is d.
Step-by-step explanation:
A person who hires an agent to represent his or her interests is known as a Principal. In the context of an agency relationship, the principal engages the agent to perform tasks or services on their behalf.
It is crucial for the principal to establish clear expectations and legally enforceable agreements to ensure the agent acts in the principal's best interest. In the provided options, Customer refers generally to a person or organization that pays for a product or service.
However, when relating specifically to the question of who hires an agent, Principal is the correct term. The relationship between a principal and an agent is a common feature in various business operations and legal structures where representation is required. The correct option is d.