The figure below shows a cuboid. Which one of the following is not a net of the cuboid?

1. Analyze the properties of the cuboid's faces

The given cuboid consists of $4$ identical long rectangular faces and $2$ identical square faces at the ends. In any valid net, the $4$ rectangular faces must fold to form the lateral surface (a continuous band), and the $2$ square faces must form the opposite bases.

2. Evaluate the nets by mental folding

By mentally folding the nets along the edges:

• Net (1), (2), and (4) can be folded such that the $4$ rectangular faces form the lateral tube of the cuboid without overlapping, and the $2$ square faces fold to cover the two opposite open ends.
• Net (3) has a configuration where folding the rectangular faces will cause two of the long rectangular faces to overlap on the same side, leaving one side of the cuboid open and exposed.