This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to arch a doorway
Determine the overall desired visual effect.
If your home has more than 1 visible doorway, you should consider the effect if only 1 is arched. For a more uniformed pattern, think about converting all of the doorways into arches.

Options are: I. If your home's interior has exterior arches, you may want to consider using them as a focal point. The arches affect the overall look of the home, but you don't need to replace them if that's necessary.; II. Decide the type of arch you want to construct. Organize the materials you'll need.; III. Arch doorways should usually encompass 1/2-3 feet in width. A staggered entryway can be defined by a vertical rectangle and three " horizontal " poles and three " vertical poles " placed at the side of the doorway.; IV. If your home already has one visible doorway, add curves that originate from the outside. If your home is constructed within a more trapezoid pattern, add a curve that should be angled inward to create a sprinter-like look.;
The answer is:
II.