Which of these scientific instruments was the first to allow researchers to directly visualize individual atoms?

Laboratory equipment and scientific instruments have revolutionized how we understand our world. Behind many major scientific discoveries are innovative products that enabled researchers to push boundaries. This poll tests your knowledge of iconic scientific tools and instruments that transformed research capabilities and led to breakthrough discoveries. Can you identify which famous product changed the course of scientific history?

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Scanning Tunneling Microscope (STM), invented by Gerd Binnig and Heinrich Rohrer at IBM Zurich in 1981
Nuclear Magnetic Resonance (NMR) Spectrometer, developed by Felix Bloch and Edward Purcell in 1946
X-ray Crystallography Machine, pioneered by Rosalind Franklin in the early 1950s
Transmission Electron Microscope (TEM), invented by Ernst Ruska and Max Knoll in 1931