A metal airtight container or other approved containers are

• A. Fire Retardant Container
• B. Sealed Glass Container
• C. Non-Vented Metal Box
• D. Plastic Bin

Answer: (A)

Metal airtight containers or other approved containers are fire retardant. The goal is to store flammable liquids safely by limiting vapor release and resisting ignition, reducing fire risk in an esthetics setting where solvents and alcohol-based products are common. Fire retardant containers are designed to withstand heat and keep fumes contained, which is why they’re the required standard. Sealed glass can still break and isn’t inherently fire retardant; a non-vented metal box or a plastic bin may not meet the approved or fire-resistance requirements, so they don’t satisfy the safety rule.