Which of the file information given in options is useful to recover from a crash?
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Which of the file information given in options is useful to recover from a crash?
Show answer & explanation
Backup information is essential for system recovery after a crash because it contains snapshots of file states saved prior to the crash, allowing data to be restored. File Type, File Name, and Last usage are metadata attributes that describe files but do not contain the actual data needed for recovery—they help identify and locate files but cannot restore lost or corrupted data.
Step-by-step Derivation:
System crash recovery requires actual data restoration. Backup information stores complete copies or snapshots of files saved before the crash occurred. When a crash happens, the system can restore files from these backups. In contrast: (B) File Type only indicates format (e.g., .txt, .exe), (C) File Name is just an identifier, and (D) Last usage is a timestamp—none of these contain recoverable data. Only backups contain the redundant data needed for recovery.