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Multiple ChoiceHard 30s

Isolation Levels

Choose the best answer for: transaction isolation
Options
  1. 1Read Uncommitted, Read Committed, Repeatable Read, Serializable
  2. 2Isolation levels are a NoSQL-only idea, absent from SQL databases
  3. 3Isolation doesn't affect concurrency, so all levels behave the same
  4. 4Only Read Committed exists; the other three levels were removed

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