Which significant change did Texas Instruments make to their calculator logo in 1997 that reflected a shift in their brand identity and product focus?

Texas Instruments (TI) calculators have been a staple in mathematics education for decades. Their iconic graphing calculators revolutionized how students learn and apply mathematical concepts. Behind every successful product is thoughtful brand design that evolves with the times. This poll tests your knowledge about the visual identity of one of mathematics education's most recognized tools. Do you know the story behind the famous TI calculator logo evolution?

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They changed from a square logo to a circular one to represent inclusivity in mathematics
They introduced the red 'TI' emblem that became a distinctive mark on their educational calculators
They removed all text and switched to a pure geometric symbol representing mathematical precision
They incorporated a graph curve into their logo to highlight their focus on graphing calculators