An agent may resign by substantially complying with a method of resignation provided in the terms of the power of attorney or, if the terms of the power of attorney do not provide a method or the method provided in the terms is not expressly made exclusive or is not possible to achieve, by giving written notice to the principal and, if the principal is incapacitated:
(1) to the conservator or guardian, if one has been appointed for the principal, and a coagent or successor agent; or
(2) if there is no person described in subsection (1), to:
(A) a parent, spouse, or descendant of the principal;
(B) the principal's caregiver;
(C) another person reasonably believed by the agent to have sufficient interest in the principal's welfare; or
(D) a governmental agency having authority to protect the welfare of the principal.