What defines a Type 1 Engine?

A Type 1 Engine is a classification defined by specific standards and features. It is typically recognized as a structural engine that is capable of responding to urban incidents. The defining characteristic is that it usually has a crew of four firefighters on board. This crew size allows for effective management of structural firefighting operations, enabling the team to efficiently tackle fire incidents as well as perform rescues, provide medical assistance, and offer other critical services in an urban or suburban environment.

The other choices do not accurately represent the characteristics of a Type 1 Engine. While wildland response capabilities, heavy rescue configurations, and all-terrain vehicles serve important functions in emergency response, they pertain to different classifications and operational contexts within firefighting. Thus, choice B stands out as the correct answer since it captures the essence of what a Type 1 Engine is designed for and its operational crew requirement.