Your employer is planning to place wireless devices at the entrance of their retail locations. The devices will use WiFi to connect to the store's wireless network and use beams of light to detect when someone enters through the entrance. Other than WiFi, what type of wireless communication is being used?
802.11
NFC
Infrared
Bluetooth
Infrared is the only option that uses light as a communication medium. 802.11 (the standard for WLAN), Near Field Communication (NFC) & Bluetooth all use Radio Frequencies. Infrared is best for the type of device in the question as it requires line of sight to operate. When LOS is broken the device will register a person in the entrance.
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