Which major mathematics textbook publisher first pioneered the 'Growth Mindset' marketing approach, completely rebranding their products around the psychological principle that mathematical ability is not fixed but can be developed?

In the world of mathematics education products, marketing strategies have evolved significantly over the decades. Publishers and educational technology companies use various psychological approaches to position their products in this specialized market. This poll tests your knowledge about a famous marketing pivot that changed how we perceive mathematical learning tools today.

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Pearson Education, with their 2012 'Everyone Can Math' campaign
McGraw Hill, through their 2015 'Mathematical Confidence' initiative
Cengage Learning, via their 2014 'Unlimited Mathematics' program
Houghton Mifflin Harcourt, with their 2013 'Math Without Limits' rebrand