Which famous calculator brand was the first to introduce a graphing calculator to the retail market, creating a product that became mandatory in many high school and college math courses?

The intersection of mathematics and retail has created some fascinating products and brands. From calculators to educational software, mathematical tools have evolved into significant retail products with their own market dynamics. This poll tests your knowledge about a famous mathematical product that revolutionized how students and professionals approach complex calculations.

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