(1) If the Commissioner finds that a bush fire hazard exists on land to which a bush fire hazard complaint relates, the Commissioner--(a) may direct a hazard management officer to serve a notice under section 66 on the owner or occupier of the land if no bush fire hazard reduction notice has been served on the owner or occupier of the land, or(b) may, subject to sections 67 and 68, exercise his or her powers under section 70 in respect of the land if a bush fire hazard reduction notice has been served on the owner or occupier of the land.