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The correct response indicates that a commercial motor vehicle transporting hazardous materials must display placards at the front, rear, and both sides of the vehicle. This requirement is in line with regulations established by the Pipeline and Hazardous Materials Safety Administration (PHMSA) and the Department of Transportation (DOT). The visibility of placards from multiple angles is crucial for ensuring safety and awareness among other drivers and emergency responders about the potential hazards being transported.

Having placards on all four sides of the vehicle allows for immediate identification of the hazardous materials in case of an accident or breakdown. This is important not only for compliance with safety regulations but also for minimizing risks to public safety, as it allows emergency responders to make informed decisions when approaching a potentially dangerous situation.

Other options suggest a more limited display of placards, which would not provide adequate warning or identification of hazardous materials, potentially leading to safety concerns and non-compliance with regulations. Placarding requirements are specifically designed to enhance safety and communication regarding the nature of the cargo carried by hazardous materials vehicles.