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
Answer: D
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.