What term is used to describe openings in a building that may be secured?

The correct term to describe openings in a building that may be secured is "windows." Windows are architectural features designed to provide light and ventilation while also serving as openings that can be secured or locked to prevent unauthorized access. The ability to secure windows with locks, security bars, or other mechanisms plays a critical role in enhancing the security of a building.

Doors, while also openings that can be secured, are specifically designed for entry and exit, usually providing a primary access point. Walls are not openings; instead, they form the structural boundaries of the building. Roofs likewise are not considered openings, as they cover the top of a building and do not typically provide access in the way that windows and doors do. Therefore, within the context of secured openings, windows are the most appropriate answer.