210.70(A) is for 'Habitable Rooms', meaning interior, heated , sheltered, yadda,yadda, yadda.....
210.70(A)(2)
{the following} is for 'additional locations'.
(c) would seem to indicate 3 & 4 ways on the
inside......
(2) Additional Locations. Additional lighting outlets shall be installed in accordance with (a), (b), and (c).
(a) At least one wall switch-controlled lighting outlet shall be installed in hallways, stairways, attached garages, and detached garages with electric power.
(b) For dwelling units, attached garages, and detached garages with electric power, at least one wall switch–controlled lighting outlet shall be installed to provide illumination on the exterior side of outdoor entrances or exits with grade level access. A vehicle door in a garage shall not be considered as an outdoor entrance or exit.
(c) Where one or more lighting outlet(s) are installed for
interior stairways, there shall be a wall switch at each floor level, and landing level that includes an entry way, to control the lighting outlet(s) where the stairway between floor levels has six risers or more.