Contingency plan before making significant changes

Contingency plan before making significant changes

Business Economics

Does anyone know the answer to the following question:

An administrator is required to write a contingency plan before making significant changes to a production virtual server. If the change fails, the server must be reverted to its original configuration in a relatively short amount of time. Which of the following will BEST achieve that goal?

  1. Snapshots
  2. Sandboxing
  3. White box testing
  4. Initial baseline configuration
  5. Trusted OS
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