In a polygon, the apothem is a segment from the center of the polygon that is perpendicular to one of its sides. To determine which line segment is the apothem from the options provided (AD, AB, CD, or CB), we would need to assess their orientations relative to the sides of the polygon.
If you can provide a description of where these points are located or what kind of polygon is represented in the image, I can help you identify which segment is the apothem.