Which of the following may significantly reduce data loss if multiple drives fail at the same time?

A.
Virtualization

B.
RAID

C.
Load balancing

D.
Server clustering

Explanation:
RAID, or redundant array of independent disks (RAID). RAID allows your existing servers to have more
than one hard drive so that if the main hard drive fails, the system keeps functioning.
Incorrect Answers:
A: Virtualization is the foundation for cloud computing. It makes it possible by abstracting the hardware
and making it available to the virtual machines. The abstraction is done through the use of a hypervisor,
which can be either Type I (bare metal) or Type II (hosted); not at all reducing data loss in case multiple
drives fail.
C: Load balancing is a way of providing high availability by splitting the workload across multiple
computers; however it does not reduce data loss in case multiple drives happen to fail.
D: Anytime you connect multiple computers to work/act together as a single server, it is known as
clustering. Clustered systems utilize parallel processing (improving performance and availability) and add
redundancy (but also add costs).

Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis,
2014, pp. 234-235