Which of these product innovations most significantly altered architectural possibilities in the mid-20th century?

Test your knowledge about famous product designs that revolutionized architectural practices! Throughout history, certain innovative products have fundamentally changed how architects approach their work, influencing building techniques and design possibilities. This question focuses on a groundbreaking product that transformed the architectural landscape in the 20th century. Can you identify which architectural product innovation truly changed the profession?

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Laminated safety glass by Otto Tschira (1957)
Post-tensioned concrete system by Freyssinet (1928)
Aluminum curtain wall system by Reynolds (1952)
Prefabricated modular flooring by Haworth (1961)