Which component is specifically mentioned as being part of a hinge door?

The bottom rail is indeed a crucial component of a hinge door, as it is the horizontal member that runs along the bottom edge of the door. It provides structural support and stability to the door while enabling it to swing open and closed around its hinge. This bottom rail is essential for protecting the door from wear and tear at the bottom, where it may come into contact with the floor or other surfaces.

In contrast, the window sill is mainly associated with windows and does not play a role in the function or structure of hinge doors. Ceiling joists are structural elements that support the ceiling and are unrelated to door mechanisms. Meanwhile, the floor plate is typically referred to in the context of framing and flooring systems, which serve different purposes compared to the specific requirements of hinge doors. Thus, the bottom rail is the only option that directly pertains to the characteristics and functionality of a hinge door.