(a) The court shall examine all persons appearing before it pursuant to this part. The examination of each person shall be conducted separately but within the physical presence of every other person unless the court, in its discretion, orders otherwise.
(b) The prospective adoptive parent or parents shall execute and acknowledge an agreement in writing that the child will be treated in all respects as their lawful child.
(c) If satisfied that the interest of the child will be promoted by the adoption, the court may make and enter an order of adoption of the child by the prospective adoptive parent or parents.