You are designing a physician portal app in Node.js. This application will be used in hospitals and clinics that might have intermittent internet connectivity. If a connectivity failure occurs, the app should be able to query the cached dat a. You need to ensure that the application has scalability, strong consistency, and multi-region replication. What should you do?
A. Use Firestore and ensure that the PersistenceEnabled option is set to true.
B. Use Memorystore for Memcached.
C. Use Pub/Sub to synchronize the changes from the application to Cloud Spanner.
D. Use Table.read with the exactStaleness option to perform a read of rows in Cloud Spanner.
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