(a) In an effort to identify the natural father, the court shall cause inquiry to be made of the mother and any other appropriate person by one of the following:
(1) The State Department of Social Services.
(2) A licensed county adoption agency.
(3) The licensed adoption agency to which the child is to be relinquished.
(4) In the case of a stepparent adoption, at the option of the board of supervisors, a licensed county adoption agency, the county department designated by the board of supervisors to administer the public social services program, or the county probation department.
(b) The inquiry shall include all of the following:
(1) Whether the mother was married at the time of conception of the child or at any time thereafter.
(2) Whether the mother was cohabiting with a man at the time of conception or birth of the child.
(3) Whether the mother has received support payments or promises of support with respect to the child or in connection with her pregnancy.
(4) Whether any man has formally or informally acknowledged or declared his possible paternity of the child.
(5) The names and whereabouts, if known, of every man presumed or alleged to be the father of the child, and the efforts made to give notice of the proposed adoption to each man identified.
(c) The agency that completes the inquiry shall file a written report of the findings with the court.