You are configuring a brand new PostgreSQL database instance in Cloud SQL. Your application team wants to have an optimal and highly available environment with automatic failover to avoid any unplanned outage. What should you do?

A. Create one regional Cloud SQL instance with a read replica in another region. B. Create one regional Cloud SQL instance in one zone with a standby instance in another zone in the same region. C. Create two read-write Cloud SQL instances in two different zones with a standby instance in another region. D. Create two read-write Cloud SQL instances in two different regions with a standby instance in another zone.