In the construction scenario, which element is described as environment rather than part of the distributed system?

• A. Materials
• B. Worker
• C. Blueprints
• D. House

Answer: (A)

The main idea is the boundary between what the distributed system controls and what it relies on from the outside. The distributed system includes the workers acting as agents, the blueprints that guide their actions, and the house as the produced result. The environment consists of external resources the system uses but does not manage directly, such as materials, weather, and site conditions. Materials come from outside the system and are external inputs rather than internal components, so they are described as environment rather than part of the distributed system.