State X on the West Coast is experiencing a severe measles outbreak. The state's public health department compiled evidence that this outbreak started because a large number of children in public schools are unvaccinated. Which one of the following could State X do?

Prohibit unvaccinated children from public schools with a medical exemption

Provide a philosophical exemption from the requirement to vaccinate children in public schools

Provide a religious exemption from the requirement to vaccinate children in public schools

Engage in a mass media campaign urging parents to vaccinate their children

All of the above