It is presumed, unless the contrary is proved, that:
(a) an affidavit purporting to have been witnessed in accordance with sections 14 and 2011_Acto013.html#_Ref254872754">15 was so witnessed; and
(b) a document purporting to have been attested by a commissioner for oaths was so attested; and
(c) a relevant document, as defined in section 25 , purporting to have been counter-signed in accordance with that section was so counter-signed.