If a customer needs to change the permissions of a file to Read-only for all users, what is the recommended method?

A.
Always use command line tools to adjust file permissions.

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 folders Get Info window.