To meet HipLocal's business requirements for storing application state, which Google Cloud database service should they migrate to?

Context:

• Current setup uses a single-instance MySQL database in GCP.
• Needs global scalability, compliance (e.g., GDPR), and reduced management overhead.
• Requires elastic scaling, logging, and monitoring.
• Must support consistent user experience across regions and concurrent user growth.

(Note: The question assumes familiarity with GCP database services like Cloud Spanner, Firestore, or Cloud SQL, and their alignment with the case study’s technical/business needs.)