Which of the following wireless technologies has the shortest transmission distance?

Near Field Communication (NFC) operates over extremely short distances, typically a few centimeters, making it technically the shortest-range technology for proximity interactions.

Infrared (IR) communication, particularly for data transfer (IrDA), typically has a very limited transmission range, often less than 1 meter, and strictly requires a direct line of sight. This makes its practical effective distance for transmitting information shorter than Bluetooth and Wi-Fi.

Bluetooth has a transmission range typically up to 10 meters (Class 2) or even 100 meters (Class 1), which is significantly longer than IR.

Wi-Fi has a transmission range typically spanning tens to hundreds of meters, making it the longest-range technology among the given choices for local area networking.