(a) It shall be prohibited to use for sleeping purposes any kitchen, nonhabitable space, or public space.
(b) It shall be prohibited, in lodging houses, to use for dining purposes any communal kitchen containing less than 100 square feet of floor area, or any nonhabitable space or public space other than dining space.
(c) It shall be prohibited to prepare or eat meals in lodging units.
(d) It shall be prohibited to use any cellar space as habitable space.