The key idea is combining a film-forming capability with a fluoroprotein base. This type uses a protein foam foundation blended with fluorinated surfactants, which lowers surface tension and creates a stable, spreading film on hydrocarbon fuels. That film blankets the surface quickly, helps separate the fuel from the air, and improves knockdown and recovery resistance—precisely what you want for Class B fires. Among the options, this specific combination is described as film forming fluoroprotein foam. Other foams may be film-forming or fluoroprotein-based, but not both together in this particular formulation, so they don’t fit as well.

Observations should begin outside the building because the exterior view provides essential context and safety first. From outside you can identify how to approach the structure, where the main entry points and other access routes are, and what surrounding hazards or obstacles might influence entry and egress. You also get a clear read on the size, shape, construction cues, nearby water sources, street layout, and potential collapse zones—all of which shape the plan for any interior survey and firefighting actions. Establishing this exterior baseline helps you determine safe staging areas, anticipate where interior hazards may be most concentrated, and decide which sides to inspect first. With that context in hand, you can then move inside to map rooms, occupancy patterns, and internal hazards more accurately and safely.

Stabilization relies on devices that securely hold objects in place and distribute load to prevent movement. Jacks lift and support a vehicle or structure at a chosen height, wheel chocks block wheels to stop rolling, and cribbing uses stacked blocks to create solid, adjustable support that resists tipping. A sledgehammer, however, is used to deliver impact to break or move objects, not to provide support or prevent movement. Using it for stabilization could cause shifting or collapse, increasing danger. Therefore, the item that is not a stabilization tool is the sledgehammer.

Manual initiating devices are what occupants use to start the fire signaling system. The term that best fits the device occupants activate is pull stations. They’re designed to be highly visible and easy to reach, typically located near exits or along hallways, and require a deliberate action—pulling a lever or breaking a glass covering—to trip the circuit. When a pull station is activated, it sends a signal to the fire alarm control panel, which then alerts occupants and notifies the fire response system. Push buttons can appear as initiating devices in some systems, but the classic, widely recognized occupant-activated device for manually initiating the alarm is the pull station. The control panel is the central unit that processes signals, not the device occupants physically actuate, and “initiating devices” is the broader category that includes both manual and automatic triggers.