Which of these contactless payment innovations was FIRST widely adopted in public transportation systems?

The transportation industry has seen remarkable innovations in payment systems over the years. From paper tickets to contactless payments, the way we pay for transportation has evolved dramatically. This trivia question tests your knowledge about a groundbreaking payment innovation that changed how commuters interact with public transit systems worldwide. Can you identify which technology revolutionized urban mobility payments first?

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RFID transit cards (like London's Oyster or Hong Kong's Octopus)
Mobile phone NFC payments (Apple Pay, Google Pay)
Biometric payment systems (fingerprint/facial recognition)
QR code ticket scanning systems