Section 119. Presumption from acknowledgement rebuttable
The presumption of paternity arising from acknowledgement may only be rebutted by –
(a) disclaimer on the part of the person acknowledged;
(b) proof of such proximity of age, or seniority of the acknowledgement, as would render the alleged relationship physically impossible;
(c) proof that the acknowledgee is in fact the child of some other person; or
(d) proof that the mother of the acknowledgee could not possibly have been the lawful wife of the acknowledgor at the time when the acknowledgee could have been conceived.