Which contactless payment innovation was widely adopted by restaurants during 2020-2021, allowing customers to pay without physical interaction with staff?

The restaurant industry has undergone significant changes in payment technology, especially in recent years. From traditional cash registers to sophisticated integrated systems, the evolution of payment methods has transformed the dining experience. This poll tests your knowledge about a notable innovation in restaurant payment processing that has dramatically changed how customers settle their bills in modern dining establishments.

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QR code-based payment systems that let diners view, split and pay bills from their smartphones
RFID wristbands that customers tap on table sensors to complete transactions
Biometric fingerprint scanners linked to customer payment accounts
Automated ceiling-mounted cameras that identify diners and charge their accounts when they exit