Answer (D) is correct . A hot site is a service bureau that is immediately available for purposes of disaster recovery. Failover is a backup operational mode used to make systems more fault-tolerant. The functions of a system component (such as a processor, server, network, or database) are assumed by secondary system components when the primary component becomes unavailable through either failure or scheduled down time. Failover is typically an integral part of mission-critical systems that must be constantly available. It involves automatically offloading tasks to a standby system component so that the procedure is as seamless as possible to the end user. Disaster prevention is also an important aspect of most disaster recovery plans. However, data conversion operators are not part of a disaster recovery plan. They perform the tasks of data preparation and transmission, for example, conversion of source data to magnetic disk or tape and entry of transactions from remote terminals.
Answer (A) is incorrect because A hot-site recovery system is an important aspect of a disaster recovery plan.
Answer (B) is incorrect because Automatic failover is an important aspect of a disaster recovery plan.
Answer (C) is incorrect because Focus on disaster prevention is an important aspect of a disaster recovery plan.
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