Generally, when the fire handle of the fire-extinguishing system on an aircraft is pulled, the effects are 1. closing of the LP valve of the fuel system 2. opening of the air bleed valves and HP valves on the engine concerned 3. setting of extinguishing systems 4. closing of the isolation and de-icing valves 5. isolation of the associated electric current generators 6. immediate discharge of extinguishing agent The combination regrouping all the correct statements is: