Isaac wants to deploy sensors to detect intruders in a facility, but he is concerned about the sensors being overly sensitive. What type of sensor is best suited to detecting intruders in an open office environment without significant expense or issues with sensitivity?

Infrared sensors are commonly used in open spaces. They are well suited to detecting individuals and are less likely to be overly sensitive. They can cover broader fields than a pressure sensor, and ultrasonic sensors are not commonly deployed as facility-level security sensors.