Which of the following indicates a system hang fault?

• A. Alert map error
• B. Clear of all symbology or symbology freezes
• C. Fault data tab shows MAPSYS
• D. System reboot

Answer: (B)

When a system hangs, the interface stops responding and often the display freezes or stops updating. The clearest sign of this state is the complete loss or freezing of symbology, where symbols either disappear or remain stuck and no input causes any change. That symptom directly points to the system not actively processing or refreshing content, which is what a hang is.

Other options describe different issues or events, not a current hang: an alert about a map error signals data or mapping problems, not a UI freeze; the fault data tab showing MAPSYS is diagnostic information about a subsystem, not the system’s runtime state; a system reboot is typically a remedy or consequence after a fault, rather than a symptom you’d observe as a hang. Therefore, the symptom of all symbology clearing or freezing best indicates a system hang.