“Prosecutor” means any of the following:
1. The Attorney General or a deputy attorney general who prosecutes a contested case pursuant to this chapter;
2. If the Attorney General and the deputies of the Attorney General are disqualified to act in such a matter, an attorney appointed by the Attorney General to prosecute a contested case pursuant to this chapter; or
3. If the regulatory body is authorized to employ or retain attorneys other than the Attorney General and the deputies of the Attorney General, an attorney employed or retained by the regulatory body to prosecute a contested case pursuant to this chapter.