Which of the Following Techniques Has Resulted in the BEST

Which of the following techniques has resulted in the BEST angular resolution of the image?

A) adaptive optics as used with Keck II on Mauna Kea
B) HST, an orbiting telescope
C) active optics, as used with the New Technology Telescope in Chile
D) interferometry, as used with the four telescopes of the VLT at the Paranel facility in Chile

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