34-12D-2. Declaration--Requirements as to execution. A competent adult may at any time execute a declaration governing the withholding or withdrawal of life-sustaining treatment. The declaration shall be signed by the declarant, or another at the declarant's direction, and witnessed by two adult individuals. The signing may be in the presence of a notary public who shall thereafter notarize the declaration. A declaration shall state the declarant's preferences regarding whether the declarant wishes to receive or not receive artificial nutrition and hydration. If the declaration does not state the declarant's preferences with respect to artificial nutrition and hydration, whether artificial nutrition and hydration is to be provided, withheld, or withdrawn shall be governed by the law of this state which would apply in the absence of a declaration.