A maintenance issue requires the building's standpipe system to be taken fully out of service. According to FDNY regulations, what must be placed at the Fire Department connection to alert arriving firefighters?
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A
A white placard detailing the scheduled maintenance.
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B
A blue tag indicating the system is undergoing testing.
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C
An orange tag indicating the system is partially impaired.
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D
A red tag indicating the system is fully out of service.