A nurse sees smoke coming from the central supply room. Which of the following actions should the nurse take first?

A. Staying close to the ground is important when moving through smoke-filled areas, but it is not the first action when identifying the source of smoke. B. Closing all doors is the first priority because it contains the fire or smoke, preventing its spread and protecting clients and staff while the fire response is initiated. This aligns with the RACE acronym for fire safety: Rescue, Alarm, Contain, Extinguish/Evacuate. C. Wrapping clients in blankets may help during evacuation but does not address immediate containment of the fire. D. Walking to a safe area is important for personal safety, but first, the fire must be contained to protect others and prevent escalation.