(1) By being canceled, defaced, obliterated, burnt, torn, or otherwise destroyed by the declarant or by some person in the declarant's presence and at the declarant's direction;

(2) By a written revocation signed and dated by the declarant expressing the declarant's intent to revoke. The attending physician shall record in the patient's medical record the time and date when the physician received notification of the written revocation;

(3) By a declarant's unambiguous verbal expression, in the presence of two adult witnesses, of an intent to revoke the declaration. The revocation shall become effective upon communication to the attending physician by the declarant or by both witnesses. The attending physician shall record in the patient's medical record the time, date, and place of the revocation and the time, date, and place, if different, of when the attending physician received notification of the revocation; or

(4) By a declarant's unambiguous verbal expression to an attending physician. [L 1992, c 84, pt of §1]