Hose that is at least 31⁄2" (88 mm) in diameter is considered __________ diameter.

Hose that is at least 3½ inches (88 mm) in diameter is classified as large diameter hose. This designation is based on the needs for water supply operations in firefighting. Large diameter hoses are typically used for drafting and supplying water to multiple lines, and they enable the rapid flow of a significant volume of water, which is critical in combating larger fires or providing adequate water supply to firefighting operations. This classification helps firefighters quickly identify the appropriate hoses for their tasks and ensures efficient water delivery during emergencies.

Smaller hoses, by contrast, are used for different purposes, such as handlines for extinguishing small to moderate structural fires or protecting exposures, and are generally less than 3½ inches in diameter. The terms "standard" and "extra-large" don’t align with typical firefighting terminology regarding hose size classification, further clarifying why large diameter is the correct answer in this context.