Sort the Failure Domain

Place each deployment card in the bucket that matches its failure-domain pattern. Single-zone Multi-zone same region Multi-region Prototype VM in one zone single-zone Pinned low-latency cache Checkout API across zones multi-zone Zone-redundant database DR copy in another region multi-region Archive replicated to second region Failure-domain classification Sorted redundancy by outage scope Ask what disappears in the failure: one zone, one whole region, or neither.

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