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Which of the following is not required safety equipment for a commercial motor vehicle?

A A siren
Explaination
Emergency equipment that is required for commercial vehicles includes at least one fire extinguisher; spare electrical fuses, unless the vehicle is equipped with circuit breakers; and warning devices for parked vehicles, such as warning triangles, fuses, or liquid burning flares.
B A fire extinguisher
C Spare electrical fuses (unless equipped with circuit breakers)