Which payment technology was first widely adopted for public transit that allowed passengers to tap and go without inserting a physical ticket?

Modern public transportation has transformed how millions of people pay for their daily commutes. From paper tickets to contactless payment systems, the evolution of transit payment methods has dramatically improved efficiency and user experience. Test your knowledge about this important aspect of transportation infrastructure that affects urban mobility worldwide. Do you know which innovation truly changed the game for commuters?

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RFID-based contactless smart cards (like London's Oyster or Hong Kong's Octopus)
QR code mobile ticketing systems
NFC-enabled smartphone payments (like Apple Pay or Google Wallet)
Biometric payment systems using fingerprint recognition