A door frame consists of what parts?

A door frame is an essential structure that supports the door and provides a finished look to the door opening. The parts of a door frame typically include two side jambs, which are the vertical components that on either side of the door, one head, which is the horizontal top part of the frame, and the surrounding assembly. The surrounding assembly encompasses the trim or casing that adds an aesthetic finish and can also contribute to the stability of the door frame.

In this context, the definition of the surrounding assembly is significant as it provides additional support and ensures proper alignment of the door, while also playing a role in protecting the wall around the door. Thus, this option accurately captures the comprehensive makeup of a standard door frame, as it considers not only the structural components but also the aesthetic elements that complete the installation.

Other options may incorrectly limit the parts included in a door frame, missing key components like the surrounding assembly that helps in both functionality and appearance.