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How should you design a highly available Cloud SQL for PostgreSQL instance to support 100 databases, each with 80 tables migrated from on-premises to Google Cloud, ensuring low-latency read and write operations for applications distributed across multiple US regions?
A
Deploy 2 Cloud SQL instances in the us-central1 region with HA enabled, and create read replicas in us-east1 and us-west1.
B
Deploy 2 Cloud SQL instances in the us-central1 region, and create read replicas in us-east1 and us-west1.
C
Deploy 4 Cloud SQL instances in the us-central1 region with HA enabled, and create read replicas in us-central1, us-east1, and us-west1.
D
Deploy 4 Cloud SQL instances in the us-central1 region, and create read replicas in us-central1, us-east1 and us-west1.