I don't see any great difference in those 3 definitions, but I suggest #2.
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CliveYes, but add the word 'temporarily'.'set aside' is rather formal.Where will I add "temporarily" ?
hhttCould be say "This account has been set aside" ? Would it be general or natural or formal?Sorry, but I don't think that is used in this situation at all. I don't see that they have the same meaning. 'Suspended account' is the only standard I have encountered. As a phrasal verb, 'set aside' would be less formal anyway.