Which innovative retail strategy did Oxford University Press implement in 2019 that revolutionized their dictionary business model?

The publishing and retail of dictionaries and language learning materials has undergone significant transformation in the digital age. Traditional dictionary publishers had to adapt to survive as online resources became prevalent. This poll tests your knowledge about how a major dictionary brand evolved its business model to remain relevant in the changing linguistic product landscape.

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They launched the Oxford Dictionary API subscription service, allowing businesses to integrate their linguistic data directly into apps and services
They eliminated print dictionaries entirely, focusing exclusively on their mobile app with in-app purchases for specialized vocabulary modules
They opened physical 'Oxford Language Cafés' in major cities where customers could purchase books while taking language classes
They pioneered the 'pay-per-definition' model where users only purchase access to specific word definitions they need to look up