What is the primary safety limitation that driving instructors must teach learners regarding Advanced Driver Assistance Systems (ADAS, such as Lane Keeping Assist and Adaptive Cruise Control)?

1. ADAS systems transform the vehicle into a Level 5 fully autonomous vehicle where driver attention is unnecessary
2. ADAS systems only function when the fuel tank is more than 90% full
3. ADAS systems eliminate all physical laws of friction and inertia
4. The learner must know the fitted system's operating domain, warnings and limits, and must meet the current driver-monitoring and takeover duties instead of assuming the system makes the vehicle autonomous