Which revolutionary e-commerce model did Wolfram Research introduce in 2019 that fundamentally changed how users access computational mathematics software?

The digital transformation has significantly impacted how mathematical products and educational tools are marketed and sold. E-commerce platforms specializing in mathematical resources have created new opportunities for educators, students, and enthusiasts to access specialized content. This poll tests your knowledge about a groundbreaking e-commerce development that changed how mathematical software is distributed and purchased worldwide.

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Wolfram Cloud Subscription - allowing users to access Mathematica through browser-based computing without local installation
Wolfram Blockchain Exchange - enabling users to trade computational algorithms using cryptocurrency
Wolfram Academic Marketplace - creating a peer-to-peer platform for professors to sell custom mathematics modules
Wolfram Neural Package - offering AI-powered mathematics solutions through a pay-per-solution model