Read the text and answer the question. TEXT A — Runway Safety Every year, airports around the world invest significant resources in keeping runways free of foreign object debris (FOD): loose hardware, fragments of pavement, plastic sheeting, wildlife remains, and misplaced tools. Even a small object can be ingested by a jet engine or damage a tire at high speed, and the consequences may include aborted takeoffs, substantial repair costs, and, in the worst cases, loss of life. Modern aerodromes therefore combine scheduled inspections with continuous reporting by operations staff, and some have adopted automated detection systems that scan the pavement with radar and cameras to alert controllers within seconds of an object being detected. Training remains essential: personnel who work near the maneuvering area are taught to recognize, report, and remove debris before it endangers an aircraft. According to Text A, the main purpose of the investments described is to:

1. Keep runways free of foreign object debris
2. Increase the number of takeoffs per hour
3. Reduce the cost of pilot training programs
4. Replace human inspectors with radar systems entirely