Which calculator brand's 1970s marketing campaign famously transformed the product from a specialized tool for engineers into a mainstream educational essential for students?

The worlds of mathematics and marketing intersect in fascinating ways! From the rise of statistical analysis in consumer behavior to innovative branding strategies for math education products, mathematics has transformed how we understand and sell products. This trivia question focuses on a groundbreaking marketing campaign that changed how a particular mathematical tool was perceived by the general public. Test your knowledge of this famous product marketing revolution!

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Texas Instruments (with their TI series)
Casio (with their fx series)
Hewlett-Packard (with their HP series)
Sharp (with their EL series)