To Compensate for Atmospheric Distortion Using Adaptive Optics, a Bright

To compensate for atmospheric distortion using adaptive optics, a bright object must serve as a target. How is this accomplished?

A) Adaptive optics can only be used when a bright star is in the field of view.
B) Sunlight reflecting from artificial satellites serves as the target.
C) Adaptive optics can only be used on very powerful telescopes for which even faint stars can be used as targets.
D) Lasers are used to excite sodium atoms in the upper atmosphere to glow and serve as a target.

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