A dual-controller, active/active storage array is servicing I/O for 10 mission-critical systems.
Controller A loses power and fails and all traffic is immediately routed to controller B and all
pending writes from controller A have been committed to disk without issue. Which of the following
features describes this functionality?

A.
Battery backed cache

B.
Data Mirroring

C.
Cache Mirroring

D.
Disk Mirroring