Home inspectors must observe and report on which of the following structural systems?

Home inspectors are required to observe and report on the roof structure and wall structure because these components are critical to the integrity and safety of a building. The roof structure is vital for protecting the building from weather elements, ensuring proper drainage, and providing energy efficiency, while the wall structure is essential for supporting the weight of the building and maintaining its stability. An inspection of these structural systems helps identify any potential issues such as water damage, structural integrity, and compliance with building codes, which are vital for the safety of the property and the occupants.

The other options do not encompass the primary responsibilities of home inspectors. Focusing solely on non-load bearing components, cosmetic aspects, or internal finishes would neglect the crucial structural components that ensure the building's safety and longevity. Home inspectors prioritize the assessment of structural systems to provide a comprehensive evaluation of the property's condition.