Who must have access to hepatitis B vaccinations at no cost?

The reasoning behind the requirement for all employees to have access to hepatitis B vaccinations at no cost stems from the occupational safety regulations designed to protect workers from exposure to bloodborne pathogens. The Occupational Safety and Health Administration (OSHA) mandates that employers must provide vaccinations to all employees who may be at risk of exposure to the hepatitis B virus, particularly those in healthcare and related fields where such exposures are more likely.

This ensures that the workforce is adequately protected and that those at risk can receive preventive measures to safeguard their health. Employees who handle blood or other potentially infectious materials are especially vulnerable, so it is important for them to have this access. Ensuring that all employees are covered under this provision helps maintain a safer working environment and minimizes the potential for outbreaks or infections related to hepatitis B.

The other groups mentioned, such as only volunteers, only managers, or only licensed personnel, do not encompass the full range of potential exposures within a workplace and thus would not provide adequate protection under public health and safety guidelines. This is why the correct answer highlights that all employees must have access to these vaccinations.