All NFPA standards are:

• A. Mandatory by OSHA adoption
• B. Voluntary if approved but the state fire marshal
• C. Required only if they relate to firefighter safety
• D. Adopted by the state or local jurisdiction

Answer: (D)

NFPA standards are voluntary documents created by consensus. They only become enforceable when an authority having jurisdiction adopts them into state or local law, or references them in building or fire codes. That’s why they’re best described as being adopted by the state or local jurisdiction—enforceability comes from that adoption, not from NFPA itself. They’re not automatically mandatory because OSHA or other agencies don’t universally adopt all NFPA standards; adoption varies by jurisdiction, and standards apply across many areas beyond firefighter safety.