What happens to the lag unit during normal operations in a lead-lag configuration?

In a lead-lag configuration, the lag unit is a backup or auxiliary component that becomes operational when the lead unit is unable to handle the demand or when it requires maintenance. During normal operations, the lead unit typically manages the primary workload, while the lag unit remains on standby. This is a strategic approach to ensure that there is continuous processing capacity without overwhelming the lead unit.

The correct answer reflects that the lag unit is not in constant use; instead, it is ready to be activated when needed. This setup allows for efficient handling of variations in demand and provides an essential safety net to maintain system reliability. By having the ability to switch the lag unit into operation, the system can adapt dynamically to changes in workload, ensuring optimal performance and preventing downtimes or overloads.

The other options do not accurately represent the function of the lag unit. While it is not always active, it certainly does not remain completely inactive; it is a critical part of the system that is ready to engage as demand shifts or when maintenance of the lead unit is necessary. Additionally, while monitoring may be beneficial for both units to ensure performance, the primary focus of the lag unit is its readiness to be deployed as needed.