Which of the following describes the construction of a 'Semi-Floating' rear axle?

1. The axle shaft supports both vehicle weight and drive torque, with a single bearing at the outer wheel end
2. The axle shaft carries only torque, and the wheel hub is supported by two bearings on the housing
3. The axle shaft is bolted to a flange, and the housing carries all the weight
4. The axle shaft has no splines and is welded directly to the differential side gear