What is IUPAC name of following compound?

What is IUPAC name of following compound?

1. 2-Ethylhept-3-en-5-ol
2. 3-Methyloct-4-en-6-ol
3. 6-Methyloct-4-en-3-ol
4. 6-Ethylhept-4-en-3-ol

Asked in: MHT CET 2023 (11 May Shift 1)

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