A small business needs to incorporate fault tolerance into their infrastructure to increase data
availability. Which of the following options would be the BEST solution at a minimal cost?

A.
Clustering

B.
Mirrored server

C.
RAID

D.
Tape backup

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. RAID
can achieve fault tolerance using software which can be done using the existing hardware and
software.