What is IUPAC name of following compound?

What is IUPAC name of following compound?

1. 1-Methoxy-3,3-dimethylcyclobutane
2. 3-Methoxy-1,1-dimethylcyclobutane
3. 3,3-Dimethylcyclobutoxymethane
4. 1-Methoxy-3-isoproylbutane

Asked in: MHT CET 2023 (14 May Shift 2)

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