Which company first successfully introduced a graphing calculator specifically designed for mathematics education that became standard in classrooms worldwide?

In the world of mathematics, certain product innovations have transformed how we learn, teach, and apply mathematical concepts. One such revolutionary product was the graphing calculator, which dramatically changed mathematics education and professional applications. This poll tests your knowledge about a pivotal moment in mathematical product innovation history that made advanced calculations accessible to students worldwide.

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