You can digitize them, but not with any of the remaining options 5 through 9. A polygon is created by first digitizing the arcs that make up the polygon's boundary. We'll do this topology-building in the next exercise. The label point option is getting heavily used here. Label points are used both for points and for identifying polygons.
Any coverage can also contain lines.
You will repeat this for each line feature. ADS brings up a new menu. The User-ID is a number you choose to distinguish the arc you're adding from all other arcs. Hence you want it to be unique. Instead, you usually give the arc an arbitrary ID, then later attach attribute information, such as highway route number, to each arc.