In UNIX-like OS, the authority for a certain file varies depending on the user who uses it.
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In UNIX-like OS, the authority for a certain file varies depending on the user who uses it. Which of the following description is correct?
Show answer & explanation
UNIX file permissions use a three-category model: owner (user), group, and others (everyone else). Each category can have different permissions (read, write, execute). Option C correctly describes this three-tier permission system. Options A and B are incomplete (they ignore group and other permissions), and Option D incorrectly claims multiple owners/groups exist, which UNIX does not support.
Step-by-step Derivation:
UNIX file permission structure uses ls -l output format: -rwxrwxrwx owner group. The model consists of exactly three permission categories: (1) owner/user - the file creator, (2) group - users in the file's assigned group, (3) others - all remaining users. Each category independently receives read (r=4), write (w=2), execute (x=1) permissions. This allows granular access control while maintaining a single ownership model. Option C is the only description that accurately captures all three categories and their distinct permission assignments.