Which type of layer adjusts content based on the composition’s size in After Effects?

Adjustment layers are a powerful feature in After Effects that allow you to apply effects to all layers beneath them in the composition. They adapt based on the composition’s size because they extend over the entire width and height of the composition, affecting all layers below them dynamically. This means that when the composition size changes, the adjustment layer's coverage and the effects it applies will also adjust accordingly, ensuring that any effects applied will consistently render across the full area regardless of the scale or resolution settings of the composition.

In contrast, other layer types have specific attributes that do not inherently adapt to changes in composition size. A solid layer is a static color layer that does not respond to composition size changes unless manually adjusted. A null layer is used primarily for controlling other layers and does not contain visual content itself, thus having no direct relation to composition size in terms of visual adjustments. An image layer can be resized or manipulated but does not automatically adjust to the composition's size without specific scaling or repositioning, meaning it remains fixed to its imported dimensions unless altered by the user.