Which calculator design innovation by Texas Instruments in the 1970s revolutionized mathematics education by introducing visual representation of equations?

Test your knowledge about the design history of mathematical tools and products! Throughout history, the tools mathematicians use have evolved dramatically - from ancient counting boards to modern graphing calculators. This poll explores a fascinating element of product design in the mathematics industry that revolutionized how calculations are performed. Can you identify the correct milestone in mathematical product innovation?

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The TI-30, which was the first calculator to use algebraic logic instead of Reverse Polish Notation
The TI-81, the first graphing calculator that could plot functions and analyze data visually
The TI-35, which pioneered solar power in calculators eliminating the need for batteries
The TI-59, featuring magnetic cards that could store programs and formulas for later use