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D. The Safety Director should consult OSHA 1910.23 for guidance in addressing the different floor heights. 

Correct  1910.23 is part of OSHA 1910 Subpart D - Walking Working Surfaces  Subpart D includes: 1910.21  Definitions 1910.22  General Requirements 1910.23  Guarding floor and wall opening and holes 1910.24  Fixed industrial stairs 1910.25  Portable wood ladders 1910.26  Portable metal ladders 1910.27  Fixed ladders 1910.28  Safety requirements for scaffolding 1910.29  Manually propelled mobile ladder stands and scaffolds (towers) 1910.30  Other working surfaces

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