When high availability is enabled for a stand-alone DB system,the DB system has three instances running in different availability or fault domains(Answer D).
High Availability Configuration: This setup involves creating multiple instances of the DB system across different availability or fault domains to ensure redundancy and minimize the risk of downtime due to hardware or network failures.
Instances: Typically, there are three instances—one primary and two replicas—ensuring that the system can failover seamlessly if one instance goes down.
References:
OCI MySQL High Availability
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