A company recently experienced data loss when a server crashed due to a midday power outage.
Which of the following should be used to prevent this from occurring again?

A.
Recovery procedures

B.
EMI shielding

C.
Environmental monitoring

D.
Redundancy

Explanation:
Redundancy refers to systems that either are duplicated or fail over to other systems in the event
of a malfunction (in this case a power outage). Failover refers to the process of reconstructing a
system or switching over to other systems when a failure is detected. In the case of a server, the
server switches to a redundant server when a fault is detected. This strategy allows service to
continue uninterrupted until the primary server can be restored.