An entry permit must be signed by whom?

The correct answer is that the entry permit must be signed by the entry supervisor. The entry supervisor is responsible for ensuring that all safety protocols are followed before individuals enter a confined space. This includes verifying that all necessary safety precautions have been taken, such as atmospheric testing and ensuring that communication methods are established. By signing the permit, the entry supervisor officially authorizes entry and confirms that all the required preparations and procedures have been completed, thereby enhancing the safety of the entrants.

Other roles, such as the entrants and the attendant, play significant parts in supporting the safety of confined space operations, but the entry supervisor holds the primary responsibility for oversight and compliance with safety regulations, making their signature essential on the entry permit.