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In a network automation scenario, a network engineer is tasked with deploying a configuration change across multiple routers using Ansible. The engineer has a playbook that defines the desired state of the routers, including interface configurations and routing protocols. However, the engineer needs to ensure that the playbook is idempotent, meaning that running it multiple times will not change the state of the routers if they are already configured correctly. Which of the following best describes how Ansible achieves idempotency in this context?
Ansible modules check the current state of the system before applying changes, only making modifications if the desired state differs from the current state.
Ansible uses a rollback mechanism that reverts changes if the final state does not match the expected configuration.
Ansible requires manual verification after each playbook run to confirm that the configurations have been applied correctly.
Ansible automatically generates a backup of the current configuration before applying any changes, ensuring that the previous state can be restored if needed.

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