21. Scrutiny of nominations.

(a) That the candidate is disqualified for being chosen as or for being a member of the Marketing Board;
(b) That the proposer is disqualified from subscribing a nomination paper;
(c) That there has been a failure to comply with any of the provisions under rule 16 or rule 19;
(d) That the signature of the candidate or the proposer on the nomination paper is not genuine.