Which of the following is an example of a passive design strategy?

Passive design strategies focus on utilizing natural environmental forces to maintain comfortable indoor conditions without relying heavily on mechanical systems. Natural ventilation techniques exemplify this, as they involve using architectural elements like windows, vents, and building orientation to facilitate airflow and enhance thermal comfort. This approach minimizes the need for artificial heating and cooling, showcasing how buildings can maintain comfortable temperatures through thoughtful design.

In contrast, the other choices primarily involve active or mechanical methods to generate energy or efficiency. Installing solar panels is an active strategy that generates electricity, while using energy-efficient appliances relates to the selection of products that consume less energy rather than modifying the building's inherent design. Similarly, implementing smart home technology involves the use of automated systems to controlling energy use, emphasizing actions taken within a conventional framework rather than relying on passive approaches to optimize comfort and efficiency.