What is IUPAC name of following compound?

What is IUPAC name of following compound?

1. 3-Carboxy-5-ethyl phenol
2. 5-Carboxy-3-ethyl phenol
3. 3-Ethyl-5-hydroxy benzoic acid
4. 5-Ethyl-3-hydroxy benzoic acid

Asked in: MHT CET 2024 (11 May Shift 2)

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