Answer: Adjustment layer
Explanation:
The image editing tool or technique that should be used by Carter use is an adjustment layer.
The adjustment layer that can be seen in Photoshop refers to an editing tool that's non-destructive image which can be used in adding color and tonal adjustments to a particular image without the pixels changing permanently.
By using the adjustment layers, one can be able to edit and then discard the adjustments. One can also be bake to restore the original image anytime that the person wants.