Which of the following is NOT a closed set in with respect to the Euclidean metric?

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Which of the following is NOT a closed set in<br><img src='https://www.fatskills.com/images2/GradExams/31004747-B78D-49C2-938F-6C6C4A3F4420.png' height='15' width='17'/> with respect to the Euclidean metric?