Which information must be marked or stamped on a hard hat?

The correct answer highlights essential information that is required to be marked or stamped on a hard hat, ensuring safety compliance and effectiveness in protecting workers.

The "Type" refers to the specific design or functionality of the hard hat, ensuring it is suitable for the intended work environment. "Class" indicates the protective capabilities of the hard hat concerning electrical hazards, which is crucial for workers in specific industries where exposure to electrical situations may occur. The "Manufacturer" provides the source of the hard hat, which is important for verifying safety standards and product recalls if necessary. Lastly, the "Date" is critical, as it indicates when the hard hat was manufactured, ensuring that workers are using helmets that are still within their useful life and have not degraded over time.

This combination of information helps guarantee that the hard hat is appropriate for the specific hazards present in a construction environment, thus playing a vital role in worker safety.