Which statement about OCI Regions is accurate?

The accurate statement about OCI Regions is that each Availability Domain has three Fault Domains. This structure is fundamental to how Oracle Cloud Infrastructure designs its regions to enhance fault tolerance and improve the availability of applications.

Availability Domains (ADs) are isolated data centers within a region that provide physical separation and resilient infrastructure. By having three Fault Domains within each Availability Domain, OCI allows users to protect their applications from server, rack, or other localized failures. Fault Domains are designed to provide an extra layer of redundancy, ensuring that even if one Fault Domain encounters issues, the others will remain operational. This means that workloads can be distributed across the Fault Domains for improved reliability.

This design facilitates high availability and disaster recovery strategies, as it enables applications to span multiple Fault Domains within a single Availability Domain. It is a key feature that allows customers to architect their applications with better resilience against outages, thereby ensuring more consistent performance and uptime for critical services.