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A company is using a method of tests and upgrades in which a small set of end users are exposed to new services before the majority of other users. Which of the following deployment methods is being used?
Correct Answer: B
A canary deployment is a software deployment technique where a new feature or version is released to a small subset of users in production prior to releasing it to a larger subset or all the users. It is also sometimes termed a phased rollout or incremental release1. A canary deployment allows the developers to test the new service in a real environment and get feedback from the users before making it available to everyone. It also reduces the risk of failures and enables easy rollbacks if something goes wrong. A canary deployment is different from a blue-green deployment, where two identical environments are used to switch between the old and new versions of the service. A big bang deployment is where the new service is released to all the users at once, without any testing or gradual rollout. A rolling deployment is where the new service is installed in batches or stages, replacing the old service gradually until all the users are on the new version.