15. An apprentice shall be classified according to:
(1) the vocational training courses that he has taken and that are pertinent to the trade in which he was accepted as an apprentice;
(2) the hours of practice reported to the Commission by a registered employer, provided that those hours of practice pertain to the same trade as that in which he was accepted as an apprentice;
(3) the hours of practice that he can prove he has served outside of Québec.