Your company is globally distributed, and you need a globally available database with strong consistency. Additionally, you have a requirement for granular IAM permissions at the database level. Which GCP service would you recommend?

*Explanation:* To meet the requirements of a globally available database with strong consistency and granular IAM permissions at the database level, the recommended choice is **Cloud Spanner with custom IAM roles**. Cloud Spanner provides global availability with strong consistency, and custom IAM roles allow you to define granular permissions tailored to your specific needs. Other options like Firestore with custom IAM roles (may not provide the same level of global consistency), Cloud SQL with custom IAM roles (not globally distributed), Cloud Spanner with predefined IAM roles (lacks the granularity of custom roles), and Cloud Bigtable with Data Catalog (does not offer strong consistency for globally distributed datA. are less suitable for this specific use case.