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.