Which of the following represents a major logo redesign that Texas Instruments (TI) implemented for its calculator line in 1999, shifting from its traditional look to a more modern design?

Mathematics education and tools have become big business in the digital age. From calculators to educational software, various companies have established themselves as key players in the mathematics industry. This poll tests your knowledge about the logo design history of one of the most influential calculator brands that has shaped mathematics education for decades.

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Introduction of the red 'TI' logo with a mathematical integration symbol incorporated into the design
Addition of a 3D cube with mathematical equations to represent the brand's focus on advanced calculations
Implementation of a stylized abacus symbol to honor the historical roots of calculation tools
Adoption of a minimalist design featuring only the letters 'TI' in Helvetica font with no additional elements