Final answer:
The FMCSA requires a person inspecting commercial motor vehicles to d) have Air Brake certification on their CDL.
Step-by-step explanation:
The subject of this question is Business and it is relevant to high school level students.
The correct option in this question is d) have Air Brake certification on their CDL.
The FMCSA (Federal Motor Carrier Safety Administration) requires that a person performing inspections on commercial motor vehicles must have air brake certification on their Commercial Driver's License (CDL).
This certification ensures that the person has received proper training and demonstrates their competence in inspecting and maintaining the air brake systems of commercial vehicles.