What is the purpose of the 'Look Left, Look Right, Look Left Again' rule when teaching intersection entry?

1. To exercise the student's neck muscles during long driving sessions
2. To ensure the driver checks for traffic from both directions, with the final left check covering the closest threat
3. To waste time at the intersection until other traffic clears completely in a licensed driving-school program — the look-left-right-left pattern checks both directions before entering traffic.
4. To check for available parking spaces before entering the roadway