Which of the following changes are refactorings?   1.  Complexity: A developer splits a method into two smaller ones to reduce the complexity of the program.   2.Imports: Unused imports get removed by the developer.   3.Update: A developer upgrades a used library to the newest version.   4.Bugfix: A Bug within a class was fixed by a developer, so that the program is now running correctly.   5.Documentation: Comments within a class are added.

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