Pre-Blast Inner and Outer perimeters are established based on...

• A. DHS/FBI Bomb Threat Stand-Off Card
• B. National Incident Management System (NIMS)
• C. Local evacuation SOP
• D. DHS Public Safety Card

Answer: (A)

Stand-off distances for a potential explosive device are defined by a standardized reference that translates blast effects into measurable zones. Pre-Blast inner and outer perimeters are set from those distances so responders can isolate the scene and protect bystanders before specialists arrive. The DHS/FBI Bomb Threat Stand-Off Card is the best source because it provides device-type based guidance on how far to place perimeters, aligning actions across agencies. Other options don’t give the concrete blast-distance guidance: NIMS focuses on incident command and coordination rather than blast-specific perimeters; a local evacuation SOP covers evacuation procedures but not the stand-off boundaries; the DHS Public Safety Card is not the designated stand-off distance guide.