What must be readily available in addition to the required sprinkler heads?

The requirement for having fire extinguishers readily available alongside sprinkler heads is based on the principle of providing multiple layers of fire protection. While sprinkler systems are essential for automatic fire suppression, fire extinguishers serve as an immediate and manual means of tackling smaller fires before they escalate. They empower occupants to take swift action in the event of a fire, ensuring a safer environment until the fire department arrives or the sprinkler system takes effect.

Having functional fire extinguishers readily available contributes significantly to overall fire safety in a building, complementing the sprinkler system's capabilities. This redundancy in safety measures enhances the building's preparedness for fire incidents, which is a core principle of fire safety regulations and practices.

The other options, while important in their own ways, do not directly pertain to the immediate availability of equipment needed for proactive fire safety measures in complement to sprinkler systems. Replacement parts, operational instructions, and inspection logs are critical for maintenance, compliance checks, and user guidance, but they do not offer the same immediate response capability as fire extinguishers do.