The correct answer is option 1, which states that statement 1 only is correct.

Statement 1 regarding the Drishti system being a sophisticated instrument to assess the runway visual range is correct. The Drishti system is indeed a sophisticated technology that provides accurate information about the visibility conditions on runways. It is used to measure the Runway Visual Range (RVR) which is crucial for safe aircraft operations during low visibility conditions, such as fog, haze, or smog.

However, statement 2 is incorrect. The Drishti system is not developed by the Airports Authority of India (AAI). It is actually a product of the National Aerospace Laboratories (NAL) in association with the Indian Meteorological Department (IMD). The NAL and IMD jointly developed the Drishti system to enhance the safety and efficiency of aircraft operations at airports.

Therefore, the correct answer is option 1, i.e., only statement 1 is correct.