What is true about data guard setup with Fast-Start FailOver (FSFO) in OCI?

In a Data Guard setup with Fast-Start Failover (FSFO) in Oracle Cloud Infrastructure (OCI), having the primary and standby databases in different Availability Domains (ADs) is crucial for achieving high availability and disaster recovery. This configuration enhances resilience against failures, as it ensures that a failure in one AD does not impact the other, allowing for rapid failover to the standby instance located in a different AD.

This setup is particularly important in cloud environments where the infrastructure is designed to be fault-tolerant. By placing the primary and standby databases in different ADs, organizations can ensure minimal downtime and continuity of operations in the event of an outage caused by a specific AD failure.

The other options lack alignment with the operational requirements and functionalities of the Data Guard setup with FSFO. For instance, the default mode configuration, the inability to create a standby in a different AD, and restrictions on using the Database CLI for FSFO setup do not reflect the capabilities and customizable options available in OCI regarding Data Guard operations.