Which standard is referenced by ADA Accessibility Guidelines (ADAAG) as a basis?

The correct choice is ANSI A117.1 because the ADA Accessibility Guidelines (ADAAG) were developed to ensure that buildings and facilities are accessible to individuals with disabilities. ANSI A117.1 is a standard that provides detailed technical requirements for accessible design, which aligns with the principles outlined in the ADA. By referencing this standard, the ADAAG establishes a consistent set of guidelines that professionals in the field can follow to create spaces that comply with accessibility laws. This connection highlights the importance of ANSI A117.1 in setting the foundation for accessibility compliance in various public settings.

Other options do not pertain to accessibility standards in the same context. ASTM D6806 relates to the testing of specific materials, FM 4910 is focused on fire protection and safety systems, and ASHRAE 90.1 deals primarily with energy efficiency standards for buildings. These standards do not directly address accessibility requirements, making them less relevant in this context.