What type of technology does RFID utilize?

RFID, or Radio Frequency Identification, is a technology that uses electromagnetic fields to automatically identify and track tags attached to objects. The critical aspect of RFID is its reliance on radio waves to transmit data between the tag and a reader device. This technology enables contactless identification and tracking in various applications, such as inventory management and access control.

The other options do not accurately describe RFID technology. Optical sensors rely on light for detecting objects or colors, magnetic fields are used in different technologies like magstripes or inductive charging but not specifically for RFID identification, and infrared signals are commonly used for remote control devices and data transfer over short distances, which also are not characteristics of RFID technology. Hence, radio frequency identification precisely encapsulates the essence of what RFID technology employs for communication and tracking.