What information should be recorded in the system off-line entries?

The correct choice is to document the reasons for system downtime in the system off-line entries. This information is vital because it provides a record of why the fire alarm system was not operational. Properly recording system downtime reasons helps in tracking incidents that may indicate underlying problems requiring repair or maintenance.

Understandably, maintenance personnel must be aware of specific reasons for any interruptions in the system's functionality, as this documentation is crucial for ensuring that the system is restored to full functionality as quickly as possible. It also aids in compliance with safety regulations and helps in understanding patterns that may affect the reliability of the alarm system.

The other options, while important for different operational or safety aspects, do not specifically pertain to system downtime entries. Details of alarm activations, for instance, are critical for evaluating system performance but are not relevant to off-line status documentation. Similarly, knowledge of fire exits and daily inspection results, while essential for overall safety and compliance, would not belong in the log of offline system status.