正解:C
Full backup captures the entire system including the operating system, installed applications, system settings, and user data. This allows for complete system recovery to the exact previous state, which is critical after a failure.
While system state backups focus only on critical OS components and configuration data (like boot files, registry, Active Directory), they do not include user data and applications. System state recovery is quicker, but less comprehensive and requires the original hardware and OS version to restore properly.