You are tasked with setting up a disaster recovery strategy for a mission-critical application. The RTO is 4 hours, and RPO is 15 minutes. Which GCP service is most suited for this?
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Correct answer: Cloud SQL with High Availability.
Why this is the answer
*Explanation:* For a disaster recovery strategy with an RTO of 4 hours and an RPO of 15 minutes, the best choice is **Cloud SQL with High Availability**. Persistent Disk snapshots would exceed the RPO, Compute Engine with live migration doesn't cover data, Cloud Spanner with multi-region instances may be overkill for this RTO and RPO, and Datastore is not designed for mission-critical disaster recovery.
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