Identify a zero-dimensional nanostructure

The same question, asked 2 times: 4 May 2023 S2*, 12 May 2024 S1. Every wording below, oldest first.

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Question 1
4 May 2023 S2
81 $Identify a zero-dimensional nanostructure from following$
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Question 2
12 May 2024 S1
67 $Identify the example of zero-dimensional nanostructure from following.$
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