Section 10-3.4 - Classification of powers of appointment as to duty to exercise; imperative and discretionary(a) A power of appointment is either imperative or discretionary.(b) A power of appointment is imperative if the instrument creating it imposes on the donee a duty to exercise it, and it may be imperative even though it is exclusive.(c) A power of appointment is discretionary if the donee is authorized to exercise or not to exercise it.