A student briefly sees a 3ร3 grid with shaded squares in the top-left, center, and bottom-right cells. Which description matches what was shown?
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A
Top-left, center, and bottom-right shaded
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B
Top-right, center, and bottom-left shaded
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C
Top-left, top-right, and center shaded
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D
Center, bottom-left, and bottom-right shaded