In March 2015, the copilot Lubitz crashed Germanwings Flight 4U9525 in the French Alps, killing all 150 people on board. Data shows that in the flight into Barcelona prior to the doomed flight, Lubitz practiced a controlled descent, where he toyed with the planes settings, programming it for sharp descent multiple times. The selected altitude of the flight changed repeatedly, including several times being set as low as 100 feet above the ground. Lubitz also put the engines on idle, which gives the plane the ability to quickly descend. It is highly unusual for a pilot to do these. Which of the following data mining techniques could have been most likely used to prevent the tragedy? A . Decision tree classification algorithms. B . Association rule mining. C . Clustering algorithms. D . Outlier detection algorithms