Which of the following is required before employees enter a permit-required confined space?

Option B: Safety meeting only

While safety meetings are important for training and communication, they alone are insufficient for permit-required confined space entry. OSHA specifically requires atmospheric testing and a written entry permit, not just a safety meeting. A safety meeting cannot verify that the atmospheric conditions are safe or document the specific safety procedures for that particular entry.

Option C: Hard hat and safety glasses

Hard hats and safety glasses are basic PPE that may be required, but they do not address the primary hazards of confined spaces such as oxygen deficiency, toxic gases, or flammable atmospheres. OSHA's confined space standard requires much more comprehensive safety measures including atmospheric testing and entry permits before any entry can occur.

Option D: Supervisor notification

Supervisor notification is a good practice and may be part of the entry procedures, but it is not the primary requirement under OSHA standards. The supervisor cannot determine if the space is safe without proper atmospheric testing and documentation through the entry permit process. Notification alone does not ensure the space has been properly evaluated for atmospheric hazards.