Which setup loses no acknowledged writes if the database's availability zone is destroyed?

Options

• ✗ Nightly backups to object storage
• ✗ Asynchronous replication to another zone
• ✓ Synchronous replication to another zone before each commit is acknowledged Correct
• ✗ Hourly disk snapshots

Why

Only a synchronous copy guarantees every acknowledged write exists elsewhere (an RPO of zero). Asynchronous replication loses the last seconds, and backups or snapshots lose everything since they were taken.

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