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A standpipe system is the correct choice because it serves as a crucial component in providing an effective means for firefighters to access water within a building during a fire emergency. This system consists of vertical pipes that connect to a water supply and are strategically placed throughout a structure, allowing for hose lines to be attached at various points. This enables firefighters to quickly connect their hoses to a reliable water source without the need to run hoses from the street or outside the building, thereby facilitating a more rapid response to extinguishing fires.

Additionally, standpipe systems are specifically designed to provide water to various floors, making them invaluable in high-rise buildings where ground access may be limited. In contrast, while sprinkler systems are also important fire protection measures, they automatically deploy water in response to heat from a fire rather than connecting hoses for manual firefighting. Fire extinguisher systems and dry chemical systems serve different purposes, focused more on localized fire suppression rather than providing a comprehensive water supply network within a building.