How does vSphere High Availability function?

vSphere High Availability (HA) is designed to provide continuous availability for virtual machines by automatically restarting them on other hosts in the cluster in the event of a failure, such as a host crash or hardware problem. This functionality ensures minimal downtime for applications and services running in virtual machines. When a failure is detected, vSphere HA leverages the cluster's resources to restart affected virtual machines on available hosts, allowing them to run without manual intervention.

The other options do not align with the core function of vSphere HA. Cloning VMs does not relate to immediate recovery from hardware failures; rather, it is a process used for creating copies of VMs. Archiving data periodically is a backup strategy and not directly associated with high availability, which focuses on keeping services running. Similarly, dynamically increasing CPU limits pertains to resource management and performance optimization, not to the uptime and recovery capabilities provided by HA.