Which two statements regarding fault domains are true?

A fault domain is indeed a grouping of hardware within an Availability Domain (AD) in Oracle Cloud Infrastructure (OCI). This concept is crucial for ensuring high availability and fault tolerance. By segmenting hardware resources into fault domains, OCI can mitigate the impact of failures. If a failure occurs in one fault domain, it does not affect the resources in other fault domains within the same Availability Domain.

The notion that each availability domain contains a specific number of fault domains, such as five, is not accurate as the number of fault domains can vary. Additionally, the system does not automatically relaunch failed instances within a fault domain; rather, this operation requires explicit user intervention or specific configurations like setting up instance lifecycle policies. Lastly, a fault domain is not determined based on usage data but is rather a predefined segmentation of hardware resources meant to improve reliability and availability across the cloud infrastructure.