The correct answer is: Agent.
An agent is a person who is authorized to act on behalf of another person, called the principal. The agent can perform a variety of acts on behalf of the principal, such as making contracts, buying and selling goods, and collecting debts. The principal is bound by the acts of the agent if the agent has been authorized to act on the principal’s behalf.
A principal officer is a person who is authorized to act on behalf of a corporation. The principal officer is usually the president, vice president, or secretary of the corporation. The principal officer is bound by the acts of the corporation, even if the principal officer did not personally authorize the act.
A proxy is a person who is authorized to act on behalf of another person at a meeting. The proxy is usually given by a shareholder who is unable to attend the meeting. The proxy is bound by the instructions of the shareholder, and the shareholder is bound by the acts of the proxy.
A mediator is a person who helps two parties to reach an agreement. The mediator does not have the power to make a decision for the parties, but can help them to communicate and to understand each other’s positions. The parties are not bound by the mediator’s suggestions, but they may choose to follow them.