Read the paragraph and then answer the following question:
The Hubble Space Telescope (HST) is the largest telescope ever placed into orbit. Its primary concave mirror has a diameter of 2.4 m and a focal length of approximately 13 m. In addition to having optical detectors, the telescope is equipped to detect ultraviolet light, which does not easily penetrate Earth’s atmosphere.
When the HST is focused on a very distant object, the image from its primary mirror is
A. real and upright.
B. real and inverted.
C. virtual and upright.
D. virtual and inverted.
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