Which of the Following Is True Regarding the Status of an Agent

Which of the following is true regarding the status of an agent as a fiduciary?

A) Although a principal is a fiduciary,an agent is not.
B) An agent is only a fiduciary if the principal and agent agreed in a written contract that the agent would be a fiduciary.
C) An agent is only a fiduciary if the principal and agent agreed by written or oral contract that the agent would be a fiduciary.
D) An agent is only a fiduciary to the principal if a transaction of $10,000 or more is involved.
E) An agent is a fiduciary of the principal.