A supportive attorney appointment must be executed—
(a) by—
(i) the principal signing the appointment form; or
(ii) a person, who is eligible to do so under section 96, signing the appointment form in the presence of and at the direction of the principal; and
(b) by 2 persons—
(i) who are present and who witness the signing of the appointment form; and
(ii) who sign and date the appointment form in the presence of the principal and in the presence of each other; and
(c) who certify in writing in the appointment form in the manner required by section 98.