Which calculator brand first successfully positioned itself as essential for advanced mathematics education by introducing Computer Algebra System (CAS) capabilities in a handheld device?

In the world of mathematics education, certain brands have become synonymous with reliability and innovation. Calculators, in particular, have transformed how mathematics is taught and learned across different educational levels. This trivia question tests your knowledge about a pivotal moment in the history of calculator brand positioning that revolutionized mathematics education in schools and universities worldwide.

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Texas Instruments with the TI-92 (1995)
Casio with the fx-7000G (1985)
HP with the HP-28S (1988)
Sharp with the EL-9900 (1997)