Final answer:
The correct answer to the question is 'non-destructive.' Adjustment layers are non-destructive because they allow editing the image without altering the original layers beneath them.
Step-by-step explanation:
The good thing about using an adjustment layer is that they are non-destructive because they are above the affected layers. Adjustment layers provide a powerful way to apply changes to multiple layers beneath them, without permanently altering the original image data. This approach allows for greater flexibility and the ability to fine-tune edits at any point during the editing process. These layers are a fundamental tool in photo manipulation using software like Adobe Photoshop, and their non-destructive nature is a significant advantage in digital image editing.