(2) An employer may not pay the subminimum training wage set forth in subdivision (1) of this subsection to any individual:
- (A) Who has attained or attains while an employee of the employer, the age of twenty years; or
- (B) For a cumulative period of not more than ninety days per employee: Provided, That if any business has not been in operation for more than ninety days at the time the employer hired the employee, the employer may pay the employee the subminimum training wage set forth in subdivision (1) of this subsection for an additional period not to exceed ninety days.