$2.$ Several manufacturers introduced into the American market a product known as all$-$terrain vehicles $($ATVs$).$ ATVs are motorized bikes that sit on three or four low$-$pressure balloon tires and are meant to be driven off paved roads. Almost immediately, the Consumer Product Safety Commission began receiving reports of deaths and serious injuries. As the number of injuries and deaths increased, the CPSC began investigating ATV hazards. According to CPSC staff, children under the age of sixteen accounted for roughly half the deaths and injuries associated with this product. What type of rule, if any, may the CPSC issue for ATVs?