What is the requirement of Feature 27, Antimicrobial Activity for Surfaces?
a) Clean surfaces with a UV device that has an output of at least 4 mW/cm2
b) Utilize vacuum cleaners with HEPA filters
c) Clean surfaces with mops, rags, and dusters that consist of microfiber with a denier of 1.0 or less
d) Utilize floor scrubbers that incorporate water-based solvents
