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ISACA Certified Information Systems Auditor · Isaca
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parallel strategy is often considered the safest option because it allows the old system to serve as a perfect backup. However, the question asked for the MOST efficient way to decrease business downtime.
Parallel allows observation of new system before phasing out of old system.
Parallel - run both systems. The old and new systems run side by side until the new one is proven reliable. This minimizes downtime since the old system remains operational as a backup.