A visitor pays by tapping a phone on a terminal. No browser opens and no network name is chosen. Which feature does the tap use?
Select an answer to reveal the explanation.
Short Explanation
The phone only has to touch the reader, the way a badge touches a door sensor. That short tap is near-field communication. You are not typing a Bluetooth code, you are not using the map, and you are not joining a wireless network.
Full Explanation
Near-field communication is the very short-range radio used for tap-to-pay and similar exchanges. A payment that completes on a tap, with no browser and no network name, matches that feature. Bluetooth pairing usually asks for confirmation or a code and works over a longer short range than a tap on a terminal. GPS reports location. It does not talk to a payment terminal and it does not charge a card. Wi-Fi requires an association to a network. The stem says no network name is chosen, so the phone is not joining Wi-Fi to pay. Exam caveat: the wallet app and the terminal still have to support the same tap-to-pay scheme. The radio being NFC does not by itself mean every terminal will accept the phone. Operational check: tap a known-good terminal, confirm the charge appears, and confirm the phone did not prompt for a Wi-Fi network. Try the tap with the phone's Wi-Fi off so a wireless join is not what actually paid. Confirm the charge on the terminal receipt, not only on the phone animation.