How would we attach a freight container to the vehicle’s loading surface?

1. With steel cables – if a screw anchor (twist lock) is absent.
2. With the walls of the loading surface.
3. Correct answer: With a screw anchor (twist lock) only.
4. With two independent chains, each connected to the loading surface.

WhyA container is attached to the platform only with twist locks. Cables, chains and sides are not suitable.