43. What statement is true concerning the door interlock devices associated with a winding drum or traction drive passenger elevator onboard ship?

Door interlocks are used to override elevator emergency status in a shipboard emergency when elevators are required to be used.
Door interlocks are used to prevent elevator operation if the doors are still open and only allow elevator operation if the doors are proved closed.
Door interlocks are used to prevent elevator operation if the doors are still closed and only allow elevator operation if the doors are proved open.
Door interlocks are used to prevent elevator operation in a shipboard emergency when elevators are not to be used.

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