Which of the following materials is NOT mentioned for the sign at the remote fire department connection?

The correct choice indicates that plastic is not listed as an acceptable material for the sign at the remote fire department connection according to NFPA 24 standards. The standards typically specify that signs for remote fire department connections should be made from durable materials to ensure visibility and longevity under various environmental conditions. Metal is commonly used due to its strength and resilience, while plate options are usually considered for their clarity in conveying information. Hence, when it comes to signage crucial for fire department readiness and response, materials that comply with durability and legibility requirements are emphasized, making plastic an unsuitable option for this specific application. This understanding underscores the importance of selecting materials that meet stringent safety and operational requirements in fire protection systems.