Detected!

Riddle: A city has one million inhabitants which one hundred are terrorists. Facial recognition software has been installed on security cameras to sound an alarm when detecting a terrorist. There are two bugs: 1. False negative: When scanning a terrorist, the alarm will only sound 99 percent of the time. 2. False positive: When scanning a non-terrorist, the alarm will incorrectly be triggered 1 percent of the time. The alarm sounds. What is the approximate probability that the inhabitant is a terrorist? a) 99 percent b) 98 percent c) less than one percent