What does the message "System OK" signify on the Commander?

The message "System OK" on the Commander indicates that the operating system is installed and functioning as expected. This status message assures users that the core software needed for the device’s operation is not only present but also running correctly without any issues. It signifies that the system is ready for use, indicating it has completed the necessary boot sequence without encountering errors.

In contrast, the other options do not accurately reflect what "System OK" signifies. "No application running" would suggest that there are no applications operating on the system, which is not what this message communicates. "System malfunction" is clearly opposite of what "System OK" implies, and "Installation successful" may refer to the successful setup of software, albeit not as definitive as indicating that the system is currently operational. Therefore, the correct interpretation of "System OK" is directly tied to the proper installation and functioning of the operating system.