What are "primary windows and doors" defined as?

The definition of "primary windows and doors" as windows and exterior doors designed to remain in their openings year-round is crucial because it highlights their functionality and permanence in a building's structure. These components are integral in providing light, ventilation, and access while also contributing to the building's thermal performance and security.

In contrast, the other options describe elements that do not fully align with the characteristics of primary windows and doors. Windows and doors that can be opened for ventilation are important features, but they do not capture the essence of primary components, which are meant to be permanent fixtures. Temporary windows and doors used during construction serve a distinct purpose that is not related to the final state of a completed building. Similarly, non-functional decorative windows and doors do not fulfill the essential roles expected from primary windows and doors. Thus, option B accurately identifies the characteristics and intended use of primary windows and doors in a building's design and construction.