What kind of proof must be provided by the operator, supplier, or sponsor for a fireworks display?

Proof of financial responsibility is vital for the operator, supplier, or sponsor of a fireworks display because it ensures that there are adequate resources available to cover potential liabilities and damages that may arise during the event. This requirement helps to safeguard public safety by making certain that in the event of an accident or incident, the responsible parties can address costs related to injuries, property damage, or other claims effectively.

In the context of a fireworks display, demonstrating financial responsibility is a crucial aspect as it reflects the operator's ability to manage risks associated with the event's execution, maintaining compliance with legal and insurance obligations. This provides peace of mind to local authorities and the community, ensuring that there are adequate financial resources to handle unexpected situations that could arise from the fireworks display.

Understanding this, the option regarding proof of financial responsibility stands out as essential for organizing fireworks events under NFPA 1123 guidelines, while the other options, though important in their own right, do not convey the same overarching responsibility to ensure both compliance and safety.