Your organization wishes to set up a geographically distributed database that supports horizontal scaling and strong consistency. Which database service should you recommend?
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Correct answer: Cloud Spanner.
Why this is the answer
*Explanation:* For a geographically distributed database that supports horizontal scaling and strong consistency, you should recommend **Cloud Spanner**. Cloud Spanner is designed to provide horizontal scaling across multiple regions while maintaining strong consistency, making it an ideal choice for distributed and highly available databases. Cloud SQL is not designed for horizontal scaling. Firestore in Native mode does not guarantee strong consistency across multiple regions. BigQuery is not a general-purpose database and doesn't support horizontal scaling. Firestore in Datastore mode is not the best option for strong consistency in a geographically distributed database.
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