Which mathematical tool brand first introduced color-coding on packaging to indicate difficulty levels (beginner to advanced), revolutionizing how consumers selected appropriate products for their skill level?

In the world of mathematics education and resources, companies are constantly innovating to enhance learning experiences through better products. Behind these educational tools are fascinating branding decisions, marketing strategies, and retail innovations that shape how we interact with mathematical concepts. This poll tests your knowledge about a significant packaging innovation that revolutionized how a mathematical product was presented to consumers.

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Texas Instruments (for their graphing calculators)
Casio (for their scientific calculators)
Oxford Mathematical Sets
Staedtler (for their mathematical instruments)