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A user calls the help desk. Each time he creates a new text file, permissions of 6 4 0 are applied to the file, and

A user calls the help desk. Each time he creates a new text file, permissions of 640 are applied to the file, and he must use chmod to set them to 644.
What command should you enter in the user's profile to set the default permission for newly created files to 644?
umask 640
umask -640
umask 0022
umask 0027
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