When looking at an organization's file server configuration, an IT manager determines that several outages are tied to a lack of redundancy in the disk controller configuration. Which of the…

Disk shadowing (mirroring) duplicates data across two drives but still uses the same controller, meaning a controller failure remains a single point of failure and does not resolve the controller redundancy problem.

RAID 0 is pure striping with no redundancy whatsoever, which actually increases the risk of data loss and does nothing to address controller or disk failures.

Remote journaling replicates transaction logs to a remote site for disaster recovery purposes and does not address local disk controller redundancy in any way.

Electronic vaulting copies data to a remote off-site backup location for disaster recovery, but provides no redundancy for the local disk controller configuration.

Disk duplexing mirrors data across two drives just like standard disk mirroring (RAID 1), but each drive is connected to its own independent controller channel, eliminating the controller as a single point of failure. This provides redundancy at both the disk and controller levels, which directly addresses the outages caused by a single shared controller. If one controller fails, the other continues operating independently, keeping the server online.