Which of the following describes non-permanent joining methods?

Non-permanent joining methods are characterized by their ability to connect components without the intention of creating a permanent bond. This allows for easier disassembly or adjustment as needed without damaging the materials.

The correct choice highlights methods like riveting and sheet metal folding. Riveting involves using a mechanical fastener that can be removed, thus making it a non-permanent solution. Sheet metal folding, similarly, allows parts to be joined by bending the edges, which can be undone without disrupting the material integrity in a permanent way.

Other options involve methods that typically establish strong, long-lasting connections. Choices that focus on permanent joining techniques, like welding and bonding or methods that create durable and often unremovable joints, would not align with the definition of non-permanent joining methods. Thus, the focus on methods such as riveting emphasizes the flexibility and reversibility inherent to non-permanent joints.