Which of These Is Not a Primary Element of a Fiduciary

Which of these is not a primary element of a fiduciary relationship?

A) the fiduciary has undertaken to act in the interests of another.
B) the fiduciary is properly certified.
C) the person to whom the fiduciary duty is owed is vulnerable to the fiduciary's abuse of his or her position.
D) all of the above are primary elements of a fiduciary relationship