Cloud & DevOps · Question 24 · Medium

What is blue-green deployment?

1. Deploying the new version gradually to a small percentage of users first
2. Running two identical production environments, deploying the new version to the idle one and then switching all traffic to it, which allows instant rollback by switching back
3. Deploying only on weekdays and pausing on weekends
4. Running the old and new versions on the same server with different colour themes

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