A labial frenum causes a diastema between the maxillary permanent central incisors. The lateral incisors and canines have not erupted. The most appropriate treatment is to

close the space with an orthodontic appliance

observe the case until the eruption of maxillary permanent lateral incisors and canines

perform a frenectomy

close the space after the eruption of the lateral incisors

close the space with an elastic band