Which of the following BEST describes the process of restoring service to a primary datacenter in a controlled manner, following a disaster?

Failover is the initial process of automatically or manually switching operations from a primary system to a secondary or backup system immediately after a disaster or failure occurs.

Replication is the continuous process of copying data or entire system states from a primary site to a secondary site to maintain data consistency and prepare for potential disaster recovery.

Failback is the specific process of moving operations, systems, and applications back to the primary production site after a disaster event and subsequent recovery actions have stabilized the original infrastructure. This controlled return ensures optimal performance, desired architecture, and business continuity are restored to the preferred operational environment.

Geographical diversity refers to the architectural strategy of distributing infrastructure across different physical locations to mitigate the impact of localized disasters, rather than a process of restoring service.