Which mathematical software company first introduced the 'per-solution' pricing model, where institutions pay based on the number of problems students solve rather than per-user licenses?

Pricing strategies in mathematics education products have evolved significantly over the decades. From traditional textbooks to interactive digital platforms, the mathematical principles behind pricing models have become increasingly sophisticated. This poll tests your knowledge about a groundbreaking pricing innovation that revolutionized how mathematical software is monetized and distributed to educational institutions.

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Maplesoft with its adaptive pricing algorithm in 2014
Wolfram Research with its computation-based pricing in 2017
MATLAB with its solution-tracking framework in 2015
Desmos when it launched its premium institutional platform in 2016