(1) A power of appointment may be exercised only:
(a) If the instrument exercising the power is valid under applicable law;
(b) If the terms of the instrument exercising the power:
(I) Manifest the powerholder's intent to exercise the power; and
(II) Subject to section 15-2.5-304, satisfy the requirements of exercise, if any, imposed by the donor; and
(c) To the extent the appointment is a permissible exercise of the power.