Which color psychology principle explains why McDonald's originally chose red and yellow for their brand colors?

Brand colors and logos are carefully designed to trigger specific psychological responses and create instant recognition. In the world of inventions and discoveries, the psychology behind color choices has been extensively researched and strategically deployed by major companies. This poll tests your knowledge about one of the most recognizable color schemes in retail history and the scientific reasoning behind its effectiveness.

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Red stimulates appetite while yellow creates feelings of happiness and optimism
Yellow represents innovation while red symbolizes tradition and heritage
Red symbolizes American patriotism while yellow was chosen to honor the inventor's home state flag
Yellow creates visibility from a distance while red was chosen to match their original mascot's outfit