Using Google Wallet, Consumers Can Pay for Goods in Stores

Using Google Wallet, consumers can pay for goods in stores. At check out, mobile users simply pass or tap their phone on a merchant terminal and payment is transferred. Users receive an SMS text message confirmation. The Google Wallet and similar payment systems are based on _________________________ technology.

A) Bar code
B) QR code
C) Augmented reality
D) Near field communications NFC)