What purpose does the standpipe and hose system serve?

The standpipe and hose system is specifically designed to provide a reliable and effective water supply for fire protection within buildings, particularly for installed fire protection systems. This system allows firefighters immediate access to water at various points within a structure, which is crucial for efficient firefighting operations. It enables the quick deployment of hoses and facilitates the suppression of fires in areas that may be difficult to reach with standard fire engines or equipment.

The system connects to the municipal water supply, ensuring that there is a consistent and adequate flow of water when needed. This makes option B the appropriate choice, as it aligns with the primary function of these systems to support firefighting efforts and enhance the safety of both occupants and responders during an emergency.

Other options do not fully capture the essential role of a standpipe and hose system in fire protection. The idea of supplying water for outdoor firefighting only limits the scope of its use, while drainage of excess water or recycling used water goes against the intended purpose of delivering a steady and manageable water supply for direct firefighting efforts.