The perimeter lighting at the airports should be provided on the

Perimeter lighting is a critical security infrastructure at airports designed to detect and deter unauthorized entry. According to standard aviation security protocols, such as those issued by the Bureau of Civil Aviation Security (BCAS) in India and ICAO guidelines, perimeter lights should be installed on the inner side of the airport boundary, typically along the perimeter patrol road. These lights are focused towards the perimeter fencing or wall.

This specific placement ensures that the fence and the immediate area outside it are well-illuminated, creating a glare for potential intruders while allowing security personnel on the inner road to see the boundary clearly. Placing lights on top of the wall (Option B) or watch-towers (Option D) can create shadows and blind spots at the base of the fence. Focusing lights inward (Option C) would blind security patrols and leave the perimeter vulnerable.