When reviewing file security configurations, a Linux administrator needs to determine if any files in a directory are set with the 'immutable' attribute to prevent alterations. Which command should the administrator use and what flag should they be looking for in the output?
Use the lsattr -a command and search for files with the 'a' flag
Use the lsattr -l command and look for a detailed list of attributes
Use the chattr command to check for the 'i' attribute
Use the lsattr command and look for files with the 'i' flag