Which design feature did Leo Fender deliberately introduce to the Stratocaster guitar in 1954 that revolutionized the instrument's playability and sound?

Behind every iconic music experience is thoughtful product design that shapes how we hear, feel, and interact with sound. From headphones to instruments, the most successful music products combine innovation with user-centered design. This poll tests your knowledge of a revolutionary design decision that transformed an instrument's identity and sound signature. Can you identify the correct product design innovation that changed music history?

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The contoured body shape with curves that fit against the player's torso and arm
The inclusion of three pickups instead of the traditional single pickup design
The introduction of the whammy bar (tremolo system) for pitch bending effects
The bolt-on maple neck that could be easily replaced if damaged