Change the permissions of a file to read-only for all users

If a customer needs to change the permissions of a file to read-only for all users, what is the
recommended method?
A. Use the Terminal to adjust file permissions with command line tools.
B. Use Repair Disk Permissions in the Disk Utility to adjust the file’s permissions.
C. Use the Sharing & Permissions pop-up menu in the file’s Get Info window to choose read only for all users.
D. Place the file into a folder, then change folder permissions to read only using the Sharing &
Permissions pop-up menu in the folder’s Get Infowindow.
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