According to the regulations, what should be provided for adequate lighting?

Suitable lighting and emergency lighting if necessary is the correct choice because health and safety regulations mandate that workplaces must have adequate lighting to ensure safety and well-being. Proper lighting helps prevent accidents, as it enables workers to see clearly, recognize hazards, and perform their tasks effectively.

Moreover, the inclusion of emergency lighting is crucial because it provides illumination during power outages or other emergencies when regular lighting might fail. This ensures that employees can safely evacuate a building or address an emergency situation without injury.

The other options do not fulfill the regulatory requirements for adequate lighting. Relying solely on natural light may not be practical or sufficient for all work environments, especially in areas where the availability of daylight fluctuates. Having no backup systems compromises safety during emergencies, while dim lighting to cut costs can lead to unsafe working conditions if it impairs visibility.