Which retail technology innovation first allowed transportation companies to implement true omnichannel ticketing strategies where customers could start a transaction on one device and seamlessly continue it on another?

The transportation industry has witnessed significant changes in how retail experiences are delivered to travelers. From traditional ticket counters to sophisticated digital platforms, the retail aspect of transportation has evolved dramatically. This trivia question focuses on a pivotal innovation in transportation retail technology that transformed how customers interact with transportation services.

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Cloud-based ticketing platforms (2009-2012)
Mobile ticketing apps (2005-2008)
RFID-enabled smart cards (2001-2004)
Self-service kiosks (1997-2000)