GCP Cloud Digital Leader Practice Question

Firestore is a fully managed, serverless NoSQL document database that stores data as JSON-like documents. It can automatically scale to millions of users, provides multi-region replication with strong transactional consistency, and requires no server management from the developer. Cloud SQL is a managed relational service that scales vertically and is less suited to massive, globally distributed workloads. Cloud Bigtable offers high throughput but stores wide-column key/value data and does not provide document semantics or multi-region strong consistency. Cloud Storage is object storage optimized for files and blobs, not for low-latency document reads and writes.