Which calculator brand first introduced the graphing calculator to the consumer market, creating a product that would become essential in mathematics education?

The handheld calculator market revolutionized mathematics education and professional computation in the 1970s and 80s, creating intense brand competition and innovation. Companies developed distinctive marketing strategies to position themselves in educational institutions and professional settings, with some brands becoming synonymous with specific mathematical applications. This poll tests your knowledge of a pivotal product innovation that changed the landscape of mathematical tools.

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