According to the technicians, which statement regarding quarter panels is correct?

The choice indicating that some quarter panels are welded or bolted is accurate because quarter panels are designed in various ways depending on the vehicle's construction and the manufacturer's specifications. Many modern vehicles utilize both welding and bolting methods for attaching quarter panels. This approach allows for a stronger, more secure installation while also accommodating repairs or replacements more easily if needed.

Welding provides a permanent bond that is suitable for structural strength, making it ideal for areas that require greater rigidity. Bolting, on the other hand, offers flexibility for repair and maintenance, as bolted panels can be removed and replaced more easily than welded panels. The combination of these methods reflects the need for both durability and practicality in automotive design and repair practices.

The other choices do not capture the varying methods of attachment used across different models and manufacturers, which is why the statement affirming that some quarter panels are welded or bolted is the correct one.