A manufacturing company has several one-off legacy information systems that cannot be migrated to a newer
OS due to software compatibility issues. The OSs are still supported by the vendor, but the industrial software is
no longer supported. The Chief Information Security Officer has created a resiliency plan for these systems that
will allow OS patches to be installed in a non-production environment, while also creating backups of the
systems for recovery. Which of the following resiliency techniques will provide these capabilities?


A. Redundancy
B. RAID 1+5
C. Virtual machines
D. Full backups