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You've developed an update for your App Engine application and wish to deploy it without affecting your users, ensuring the ability to quickly revert if necessary. What's the best approach?
A
Notify your users about a scheduled maintenance window and deploy the update during this period.
B
Deploy the update as a new version and gradually shift traffic from the current version to the new one.
C
Remove the current version of your application and deploy the update using the same version identifier as the removed version.
D
Deploy the update as the same version that is currently running.
