What are the three basic groups of emergency lighting?

The three basic groups of emergency lighting are crucial for ensuring safe egress during an emergency. EXIT signs, aisle escape path lights, and overhead lights serve specific functions in guiding passengers and crew to safety clearly and effectively.

EXIT signs are designed to indicate the location of exits and are illuminated for visibility in low-light conditions. Aisle escape path lights illuminate the path along the aisles and exits, helping passengers navigate toward safety even when normal lighting is compromised. Overhead lights provide overall illumination of the cabin area, enhancing visibility during an emergency situation.

This categorization aids in understanding the roles that different types of emergency lighting play in an evacuation scenario. The other choices may include elements associated with emergency lighting but do not accurately represent the fundamental types specifically aimed at facilitating safe evacuation in an aircraft setting.