Final answer:
The FMCSA requires that individuals performing brake system inspections and service on commercial motor vehicles have at least one year of training and experience.
Step-by-step explanation:
The question addresses the Federal Motor Carrier Safety Administration (FMCSA) regulations regarding the qualifications of individuals who perform inspections and service on brake systems of commercial motor vehicles.
According to these regulations, the correct answer is that they must have training and experience of at least one year.
It's important to note that simply holding a CDL with Air Brake certification does not fulfill these requirements. The regulations are specific in requiring a minimum of one year of either training or experience with brake systems.
To further clarify, although options a, b, and c mention other types of qualifications, it's the combination of training and experience that the FMCSA emphasizes as necessary for those overseeing brake system inspections and services on commercial vehicles.