(a) Safe, continuous and unobstructed exit shall be provided from the interior of the building to the exterior at street or grade level.
(b) Exits shall be arranged, constructed and proportioned so that occupants may escape safely from the building in case of emergency.
(c) In one and two-family dwellings, in addition to the primary exit from the building, there shall be provided a secondary exit, or in lieu thereof, one or more exit openings for emergency use.
(d) In multiple dwellings approved exits shall be provided.