Correct Answer: B (Cloud Spanner)
- A (Firestore) is incorrect because it is a NoSQL document database, not optimized for relational data, lacking the relational querying and transactional consistency needed.
- B (Cloud Spanner) is correct as it offers a globally distributed relational database service with automatic scaling, strong consistency, and global availability, ideal for applications with growing user bases.
- C (Bigtable) is incorrect due to its NoSQL wide-column design, which, while scalable and high-throughput, does not support relational data modeling as effectively.
- D (Cloud SQL) is incorrect because, despite being a reliable and scalable relational database, it requires manual configuration changes and lacks the global scalability and distributed architecture of Cloud Spanner.
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