Which technology allows devices to exchange data over short distances using radio frequency?

The technology that allows devices to exchange data over short distances using radio frequency is indeed Near Field Communication (NFC). NFC operates in the 13.56 MHz frequency range and is specifically designed for very short-range communications, typically within a few centimeters. This makes it ideal for transactions such as mobile payments, electronic ticketing, and pairing devices.

NFC's ability to facilitate quick and secure data transfer is important for applications that require immediate and low-power communication, such as tapping a smartphone on a payment terminal. The technology allows two compatible devices to establish a connection quickly, enhancing user convenience and efficiency.

While Bluetooth, Wi-Fi Direct, and infrared also facilitate communication between devices, they operate under different conditions and protocols. Bluetooth is designed for slightly longer-range communication (up to 100 meters) and generally requires more power than NFC. Wi-Fi Direct provides a high-speed connection over greater distances (often exceeding 100 meters) and allows for larger data transfers. Infrared requires a direct line of sight and is more restrictive in terms of data rates and distance, limiting its practicality for most modern applications.

Therefore, NFC is the most accurate choice among the options given for short-distance data exchange using radio frequency.