This subdivision applies if the chief executive knows or believes that a person who is a duly qualified person—
(a) has contravened section 121B ; or
(b) has performed the work of a duly qualified person under this part incompetently; or
(c) has engaged in fraudulent conduct in relation to the work of a duly qualified person under this part; or
(d) has been found guilty of an offence against a provision of the Act or against a law of another State that provides for the same matter as a provision of the Act .