Which of the Following Statements Is True About the Power

Which of the following statements is true about the power of attorney?

A) For business purposes, an agent's authority is determined by customs, circumstances, and the facts of a situation rather than a written or oral agreement.
B) It permits a principal to deny that someone is the principal's agent after leading a third party to believe that the person is an agent.
C) It is formed when an unauthorized act of an agent is accepted by a principal.
D) It gives an agent the authority to sign legal documents on behalf of a principal.