During the Past Few Decades a Number of Techniques Have

During the past few decades a number of techniques have been developed to enhance the performance of optical and radio telescopes. These include all of the following except one. Which one is the exception?

A) placing optical telescopes in orbit above the atmosphere
B) building lens telescopes comparable in size to the largest mirror telescopes (approximately 10 m)
C) computer connections allowing radio telescopes thousands of miles apart to be used in unison
D) adaptive optics, allowing the shape of a telescope mirror to be changed rapidly to compensate for atmospheric turbulence

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