Which of the following is NOT a S-FACTS structure triage category?

• A. Not threatened
• B. Threatened defensible
• C. Threatened non-defensible
• D. Threatened undefensible

Answer: (D)

In S-FACTS structure triage, you quickly classify a structure by how exposed it is and whether it can be defended under the current fire conditions. The recognized categories describe three states: not threatened, threatened but defendable, and threatened but not defendable. The term used for the latter is non-defensible, not undefensible. So a category labeled “Threatened undefensible” isn’t part of the S-FACTS framework. That’s why it’s not a valid option. The other two states—threatened but defensible and threat-ened but non-defensible—fit the established categories, alongside not threatened.