Which innovative pricing strategy did Wolfram Alpha introduce that transformed accessibility to advanced mathematical computation tools?

The pricing strategies for mathematical software and educational tools have evolved significantly over the years, adapting to changing market conditions and user expectations. From traditional perpetual licensing to modern subscription models, companies have employed various approaches to balance revenue generation with market penetration. This trivia tests your knowledge about a notable pricing innovation in the mathematics software industry that disrupted the market.

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Pro-rata tiered pricing based on the complexity of mathematical operations
API-based computation pricing that charged per computational query
Educational institution bulk licensing with unlimited student access
Free basic version with premium pricing for specialized mathematical domains