You are creating a new Transparency Flattener preset. What does the Clip Complex Regions checkbox do?
1) Ensures that the boundaries between vector artwork and rasterized artwork fall along object paths
2) Rasterizes all objects, including images, vector artwork, text, and gradients, to the specified resolution
3) Converts all type objects (point type, area type, and path type) to outlines
4) Converts all strokes to simple filled paths on pages containing transparency