(a) An attorney-in-fact may resign by any of the following means:

1. (1) If the principal is competent, by giving notice to the principal.
2. (2) If a conservator has been appointed, by giving notice to the conservator.
3. (3) On written agreement of a successor who is designated in the power of attorney or pursuant to the terms of the power of attorney to serve as attorney-in-fact.
4. (4) Pursuant to a court order.