Final answer:
The agent owes fiduciary duty of reasonable care to the principal or client, who is the party the agent represents in a transaction.
Step-by-step explanation:
An agent owes the fiduciary duty of reasonable care to the principal, also known as the client. The client is the party who has entrusted the agent with the responsibility to act on their behalf in a transaction. While an agent may provide services to customers, the fiduciary duty is specifically owed to the principal who has engaged the services of the agent. Fiduciary duties include loyalty, confidentiality, full disclosure, and putting the interests of the principal above the interests of the agent or other parties.