Which mobile feature is designed to enable proximity-based interactions via radio frequency?

Which mobile feature is designed to enable proximity-based interactions via radio frequency?

• A. Messages
• B. Apps
• C. NFC
• D. QR codes

Answer: (C)

Proximity-based interactions via radio frequency rely on a short-range wireless signal to trigger actions when devices are very close together. NFC, or Near Field Communication, uses RF fields at only a few centimeters of range, letting devices exchange data or initiate functions simply by being near or tapped together. This close, radio-based interaction is exactly what NFC is built for, such as making a payment by tapping your phone or quickly pairing devices. Other options don’t fit this specific capability. Messages are text transmissions that typically travel over networks rather than relying on immediate RF contact. Apps are software programs. QR codes require scanning with a camera to read a visual code, which is a different mechanism from radio-frequency near-field communication.

Proximity-based interactions via radio frequency rely on a short-range wireless signal to trigger actions when devices are very close together. NFC, or Near Field Communication, uses RF fields at only a few centimeters of range, letting devices exchange data or initiate functions simply by being near or tapped together. This close, radio-based interaction is exactly what NFC is built for, such as making a payment by tapping your phone or quickly pairing devices.

Other options don’t fit this specific capability. Messages are text transmissions that typically travel over networks rather than relying on immediate RF contact. Apps are software programs. QR codes require scanning with a camera to read a visual code, which is a different mechanism from radio-frequency near-field communication.