You are responsible for designing a new database for an airline ticketing application in Google Cloud. This application must be able to:
Work with transactions and offer strong consistency.
Work with structured and semi-structured (JSON) data.
Scale transparently to multiple regions globally as the operation grows.
You need a Google Cloud database that meets all the requirements of the application. What should you do?

A. Use Cloud SQL for PostgreSQL with both cross-region read replicas. B. Use Cloud Spanner in a multi-region configuration. C. Use Firestore in Datastore mode. D. Use a Bigtable instance with clusters in multiple regions.