Question

merges all visible layers into a single background layer and discards all hidden layers.

○ hide

○ mask

○ layer merging

○ flattening

Explanation:

Flattening in graphic design software combines visible layers into one background layer and removes hidden ones. Hide only makes layers invisible. Mask hides parts of a layer. Layer Merging usually combines selected layers without discarding hidden ones.

Answer:

Flattening