What components are included in low-slope roof assemblies?

The correct choice encompasses all essential components that are typically part of low-slope roof assemblies. A low-slope roof assembly is designed to manage water runoff and withstand various environmental conditions.

The roof membrane serves as the waterproofing layer, protecting the underlying materials from moisture infiltration. Roof insulation is crucial for energy efficiency, as it helps regulate temperature within the building and prevents heat loss. The vapor retarder is important for controlling moisture within the roofing system, preventing condensation that can lead to damage over time. Finally, the roof deck provides structural support for the entire roofing system, ensuring stability and durability.

By including all these components, the assembly can effectively perform its functional roles while maintaining integrity over its lifespan. The other options do not provide a complete assembly, omitting critical elements needed for a comprehensive low-slope roofing system.