(B) Cabanas, greenhouses, patios, lath houses, tool sheds, playhouses, barbecue pits, fences, walkways, hedges and similar improvements and appurtenances;
(C) Private garages, parking spaces and swimming pools for the exclusive use of the residents of the premises and their guests; and
(D) One residential accessory dwelling unit or one junior accessory dwelling unit, which must be approved in accordance with the procedures and standards in Chapter 17.048 of this title.