What is the correct procedure for using a fire extinguisher, often remembered by the acronym PASS?

1. Point at the flames, Activate the nozzle, Stand back, Spray continuously.
2. Pull the pin, Aim at the base of the fire, Squeeze the handle, Sweep side to side.
3. Pull the trigger, Aim at the top of the fire, Start spraying, Stop if the fire spreads.
4. Position yourself, Activate the lever, Slowly apply, Secure the area.