An application cannot tolerate two versions running at once, even briefly. Which Deployment strategy type meets that requirement?

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Answer 1

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Answer: D. Recreate

Recreate kills every old Pod before creating any new one, so the two revisions never overlap. RollingUpdate always overlaps to some degree, and OnDelete is a StatefulSet and DaemonSet strategy.

Source: Deployments (Kubernetes) — Writing a Deployment Spec › Strategy