During fifth-wheel coupling inspection, what must you visually verify under the trailer before driving?

1. The fifth-wheel locking jaws are closed completely around the shank of the kingpin and the safety release handle is locked
2. There is a 5 cm gap between the upper coupler plate and fifth wheel skid plate
3. The kingpin is resting loosely on top of the fifth wheel plate
4. The landing gear legs are touching the ground with weight on them