What strategy did astronomers use to achieve the incredible resolving power necessary to successfully image the event horizon of

Question

What strategy did astronomers use to achieve the incredible resolving power necessary to successfully image the event horizon of the black hole in galaxy M87 Select one a They built the world s largest infrared telescope in the high desert of Chile which was able to achieve sensitivities greater than any telescope in history b They linked together a global chain of radio telescopes achieving the resolving power of a radio dish nearly the size of Earth c They used a specially engineered metallic coating on the Hubble Space Telescope allowing optical sensitivities never before imaginable d They inserted a new detector into the world s largest optical telescope allowing for sensitive observations at quelenatho prouiquchy out of reach

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