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The concept of 'Immutable Infrastructure' is best described by the idea that infrastructure components are replaced rather than modified. This approach emphasizes creating new instances of components or environments instead of making changes to existing ones. By replacing components, teams can ensure that the environment is consistent, reliable, and replicable. This minimizes the risks associated with configuration drift and simplifies the deployment process, as each new component is built in a known state, ensuring that any issues arising from changes to existing infrastructure can be avoided.

In an immutable infrastructure, the components are treated as disposable; if there's a need for an update or change, the system creates a new instance with the required updates. This practice often leads to improved stability and easier rollback procedures since the previous version can still be accessed if necessary.

The incorrect choices reflect misunderstandings of the immutable infrastructure concept. One describes constant modification, which is contrary to the very definition of immutability, while another suggests the concept of infrastructure that has no backups, which is unrelated to the principles of immutability.