How do Smart Filters work and how do you apply one?

How do Smart Filters work and how do you apply one?

• A. Converts filters into non-destructive effects on a Smart Object; apply by selecting a Smart Object and applying a filter; adjust via the Filter Gallery.
• B. They are permanent and rasterize the layer once applied.
• C. They require a vector layer to function.
• D. They can only be removed by deleting the layer.

Answer: (D)