C. Security
Security is a major part of the foundation of any system that is not totally cut off from other machines and users. Some aspects of security have a place even on isolated machines. Examples of these measures include periodic system backups, BIOS or power-on passwords, and self-locking screensavers.
A system that is connected to the outside world requires other mechanisms to secure it: tools to check files (tripwire), audit tools (tiger/cops), secure access methods (kerberos/ssh), services that monitor ...
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