Which form of BC/DR testing has the least impact on operations?

The choice indicating that a tabletop exercise has the least impact on operations is correct because this form of business continuity and disaster recovery (BC/DR) testing is typically conducted in a simulated environment where participants discuss and evaluate their roles and responses without any actual disruptions to the operational environment.

Tabletop exercises are designed to engage team members in conversation and ensure they understand their responsibilities in the event of a disaster, focusing on problem-solving and scenario planning without the need for physical resources or interventions that could disrupt ongoing business activities. This makes it a low-impact method since it avoids the complexities and potential interruptions associated with more involved testing methods.

In contrast, options such as a full test or structured test often require substantial participation and may involve taking systems offline to execute scenarios fully, which can alter day-to-day operations significantly. A dry run, while less impactful than a full test, still may require some level of operational adjustment and coordination, which could be disruptive. Thus, tabletop exercises stand out for their effectiveness in training and preparation without operational interference, reinforcing readiness while maintaining business continuity.