On a sash window, the stool would be above the:

The stool in a sash window is an important component that serves as a horizontal piece extending outwards from the interior of the window frame. Its function is to provide support for the bottom of the window and to facilitate water drainage away from the window.

The correct answer indicates that the stool is positioned above the apron. The apron is a horizontal board that is typically found under the window sill, which serves as a decorative element and helps to cover the gap between the sash and the wall. Therefore, the stool, which is wider and more prominent, sits above the apron, effectively serving its purpose while also enhancing the overall aesthetics of the window.

Understanding the architectural hierarchy of these components is vital for cabinet and millwork professionals. In contrast, the other terms—rail, jamb, and stile—refer to different structural parts of the window or door assembly, so they do not relate to the positioning of the stool with respect to the apron.