What type of exhaust system does the truck have?

The option indicating a single muffler with a heat deflector shield is correct because this configuration is commonly used in fire rescue trucks to manage engine noise while also providing effective heat management. The heat deflector shield plays an important role by helping to protect nearby components and personnel from the high temperatures associated with exhaust gases. This setup ensures that the exhaust system operates efficiently while maintaining safety standards, which is crucial in emergency response situations.

In contrast, dual mufflers can complicate maintenance and might not provide the same level of heat management that a well-designed single muffler with a shield does. Double exhaust pipes with catalytic converters may add unnecessary complexity and weight to the vehicle. A turbocharged exhaust system with a bypass is generally found in performance-oriented vehicles rather than in fire rescue applications, where reliability and straightforward operation are prioritized.