Which contactless payment technology was first widely adopted by public transit systems, revolutionizing fare collection in major cities worldwide?

The intersection of transportation and payment systems has transformed how we pay for mobility services. From traditional cash-based systems to contactless payments, the transportation sector has embraced innovative retail payment solutions to enhance customer experience and operational efficiency. Test your knowledge about this evolving landscape that's reshaping how passengers, commuters, and travelers complete transactions across various transportation modes.

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RFID-based smart cards (like London's Oyster card and Hong Kong's Octopus card)
Mobile phone NFC payments (like Apple Pay and Google Wallet)
QR code-based payment systems (like those used in China's metros)
Biometric payment systems (using fingerprint or facial recognition)