Final answer:
The correct way to use a portable fire extinguisher is to aim at the base of the fire, utilize the PASS technique, and avoid aiming the nozzle toward any combustible materials that are not burning, and not use the entire contents at once.
Step-by-step explanation:
When using a portable fire extinguisher, the accurate statement is that you should aim at the base of the fire, not the top of the flames. Aiming at the base is more effective because it targets the fuel source of the fire. The extinguisher should not be held close to the body, as it can be unsafe and reduce your ability to maneuver. You should not direct the nozzle towards combustible materials that are not on fire, as this could potentially spread the fire. Additionally, using the entire contents of a fire extinguisher at once is not recommended. Instead, you should utilize the PASS technique: Pull the pin, Aim at the base of the fire, Squeeze the handle, and Sweep from side to side.