A point-of-sale vendor issues rugged Android tablets that accept contactless payments by having customers briefly tap their smartphones against the back of the tablet. During troubleshooting, a technician is told to disable every wireless feature except the one strictly required for this tap-to-pay function so radio interference is minimized. Which mobile connection method must the technician leave enabled on each tablet?
Tap-to-pay transactions rely on near-field communication (NFC). NFC uses very short-range (usually <4 cm) 13.56 MHz radio waves and is the protocol behind Google Pay, Apple Pay, and most contactless cards. Bluetooth and Wi-Fi operate over far greater distances, are not used for payment token exchange, and can be completely disabled without affecting this feature. Infrared blasters transmit light, not radio-frequency payment data, and likewise are unnecessary.
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