Fill in the blanks.
For attics and underfloor spaces, ________, and _______, at least one lighting outlet containing a switch or controlled by a wall switch shall be installed where these spaces are used for storage or contain equipment requiring servicing. This applies to ________.
A) utility rooms / basements / only to commercial occupancies
B) ceiling cavities / cellars / only to dwelling units
C) utility rooms / basements / all occupancies