An administrator wants to prevent users from creating hard links to a certain sensitive file on a Linux system. Which command should the administrator use to achieve this security measure?
chattr +i /path/to/file
chmod 700 /path/to/file
setfacl -m u:user:--- /path/to/file
chattr +a /path/to/file
The correct answer is chattr +i /path/to/file. The chattr command changes the file attributes on a Linux file system. The +i attribute makes a file immutable, which means that the file can neither be modified nor deleted, and new links cannot be created to it. This is an advanced method for securing files that are not commonly modified but are critical to system security. The incorrect options either do not directly apply to the prevention of hard link creation, use an incorrect attribute, or are unrelated to file attributes.
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