Which statement is true regarding the vehicles of the Phoenix Fire Department?

The statement regarding the Phoenix Fire Department's vehicles being over 400 in number is accurate. The department maintains a substantial fleet to effectively manage the demands of fire suppression, emergency medical services, and rescue operations across the city. This diverse fleet includes various types of apparatus that are crucial for providing comprehensive coverage and quick response times in both urban and suburban areas.

While other options might present specific aspects of the fleet or operations, they do not reflect the complete and factual nature of the department's resources. For instance, the notion that the fleet is entirely electric does not hold true, given the existing reliance on different fuel types for various vehicles. Similarly, the operation of the department is not confined to urban settings; it often extends to suburban regions as well. Lastly, limiting the fleet to just ambulances and fire engines disregards other vital vehicles within their operations, such as ladder trucks, specialized rescue units, and support vehicles that enhance their overall capabilities.