What does RFID technology primarily utilize?

RFID technology primarily utilizes electromagnetic fields to transfer data between a reader and a tag. The system consists of tags, which contain a small chip and an antenna, and readers that emit radio waves. When a tag comes within proximity of the reader, it absorbs the radio waves and sends back its stored information via electromagnetic radiation, allowing for automatic identification and tracking of objects. This makes RFID a highly effective and efficient technology for inventory management, asset tracking, and various applications across different industries.

The other choices, while relevant in their own right, do not accurately represent the technology used in RFID. Optical scanning relies on light to read barcodes, magnetic fields pertain to different types of data storage, and acoustic waves are used in technologies such as sonar, but none of these are the primary method for data transmission in RFID systems.