Which retail company first successfully mass-marketed graphing calculators, creating a revolutionary product category that became standard in mathematics education?

In the world of mathematics education, certain retail products have fundamentally transformed how students learn and engage with complex concepts. One particular innovation created a new product category that revolutionized mathematics education in schools and universities worldwide. Test your knowledge about this influential retail success story that bridges technology and mathematics education.

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Texas Instruments (TI) with their TI-81 model in 1990
Casio with their fx-7000G model in 1985
Hewlett-Packard (HP) with their HP-28C model in 1987
Sharp with their EL-5200 model in 1986