Final answer:
To gauge how far forward to pull into a parking space, parking sensors are the most helpful tool as they provide audio cues based on distance to an object. The correct answer is option 3) Parking sensors.
Step-by-step explanation:
When pulling into a parking space, you can use parking sensors, if your vehicle is equipped with them, to help you know how far to pull in. Parking sensors use ultrasonic technology to detect objects in front of or behind your vehicle and emit a beeping sound that becomes more rapid as you get closer to an object. This can be extremely helpful in gauging distances while parking. While rearview mirrors and side mirrors are critical in maintaining situational awareness, they may not provide precise distance measurements in the same way parking sensors do.
Therefore, if you’re specifically asking about knowing 'how far forward to pull into a parking space,' parking sensors would be the most appropriate choice from the given options if your vehicle has them installed.