A customer is looking for a device that uses tap to pay when making purchases. Which of the following technologies should the customer use?

Wi-Fi (Wireless Fidelity) is used for local area networking and internet access over longer distances than tap-to-pay requires and is not designed for secure, proximity-based transactions.

IR (Infrared) is used for remote controls and short-range data transfer that requires a line of sight, which is not suitable for tap-to-pay.

Bluetooth is a short-range wireless technology typically used for pairing devices or transferring files, not for instantaneous, secure tap-to-pay transactions, for which NFC is the standard.

Near Field Communication (NFC) is a short-range wireless technology that enables communication between devices when they are tapped together or brought within a few centimeters of each other. This is precisely the technology used for contactless payments, often referred to as 'tap to pay'.