Which retail strategy did Wolfram Research implement in 2016 that dramatically changed accessibility to its flagship product Mathematica?

The digital transformation of mathematics education and research has been significantly influenced by specialized software tools. These platforms have changed how mathematics is taught, learned, and applied in professional settings. From symbolic computation to visualization tools, mathematics software has become essential for educators, students, and professionals alike. This poll tests your knowledge about a famous mathematical software company's retail strategy that revolutionized accessibility to advanced mathematical tools.

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Introduced Wolfram|Alpha Pro subscription model with tiered pricing
Launched the Wolfram Cloud platform with freemium access
Released Mathematica Online with pay-per-use pricing
Implemented a personal license subscription model replacing perpetual licenses