(2) The filing officer may require any person to answer in writing and upon oath or affirmation before a judge, justice of the peace, county clerk or notary public any question within the knowledge of that person concerning the source of any contribution. The filing officer shall advise the person of the penalty for failure to answer. [1971 c.749 §19; 1973 c.744 §19; 1979 c.190 §358; 1981 c.142 §7; 1983 c.71 §7; 1993 c.493 §74; 1995 c.712 §78; 1999 c.999 §14; 2003 c.542 §17; 2005 c.809 §§39,39a; 2007 c.848 §15; 2009 c.818 §13; 2013 c.758 §9; 2017 c.517 §5; 2018 c.70 §16]