Which innovative pricing strategy did Mathematica implement in 2016 that increased their customer lifetime value by over 200% within 18 months?

In the competitive world of educational math products, pricing strategies can make or break a company's success. This poll tests your knowledge of a famous mathematical software company's innovative pricing approach that revolutionized the educational software market and significantly increased their customer lifetime value. Do you know which strategy catapulted them to industry leadership?

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Tiered subscription model based on the golden ratio that automatically adjusted pricing as users advanced through learning levels
Fibonacci sequence payment plan where each month's subscription cost was the sum of the previous two months
Prime number discount system where customers received special pricing on days corresponding to prime numbers
Calculus-based dynamic pricing where cost decreased proportionally to the time spent using advanced features