Final answer:
A defensive attack should be used in this situation.
Step-by-step explanation:
When encountering a large volume of fire pushing from multiple windows in an unoccupied warehouse, a defensive attack is the best choice. A defensive attack focuses on containing and controlling the fire, rather than actively trying to extinguish it. This approach is safer for firefighters and allows them to protect adjacent structures and prevent the fire from spreading.
During a defensive attack, firefighters typically position themselves outside the structure and use large volumes of water to cool the fire and limit its spread. They may also use aerial appliances to direct water onto the fire from a safe distance. The goal of a defensive attack is to limit the fire's growth and protect surrounding areas until the fire can be fully extinguished.