Which of the following wall systems is least likely to require compliance with ASTM standards?

The selection of "none of the above" indicates that all mentioned wall systems may require compliance with ASTM standards. ASTM standards provide a framework to ensure materials and assemblies are tested and verified for safety, performance, and reliability.

Each wall system type mentioned can be subject to various applicable ASTM standards based on the materials used, the design, and the intended applications. For construction and building inspectors, understanding that wall systems typically used in construction must adhere to established standards is crucial. These standards cover factors such as structural integrity, fire resistance, thermal performance, and more.

Therefore, recognizing that all the listed wall systems might necessitate compliance with ASTM means they are integrated into modern construction practices, where adhering to recognized standards is important for safety and quality assurance.