Which pricing strategy is specifically used by major mathematics software companies to increase adoption in educational institutions while maximizing long-term revenue?

In the world of mathematical educational products, pricing strategies can make or break success in the competitive market. Publishers must balance perceived value, production costs, and market positioning. This poll tests your knowledge of specialized pricing approaches used for mathematics textbooks, software, and learning tools that make these products accessible while maintaining profitability.

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Versioned pricing with feature-limited 'student editions' at lower price points and full 'professional editions' at premium prices
Loss leader pricing where basic calculators are sold below cost to drive purchases of supplementary materials
Dynamic pricing that increases costs during peak academic seasons like final exams and decreases in summer
Uniform flat-rate subscription model regardless of features or user type