The correct answer is 'pkexec network-configuration-tool', as pkexec allows an authorized user to execute programs with the security privileges of another user (normally the superuser) by respecting policy definitions. Unlike sudo, pkexec will show a graphical authentication dialog if the session indicates it's graphical; sudo does not provide this and is traditionally used in a terminal. polkit is not a command; it's the toolkit to which pkexec belongs. The pexec command does not exist, and sudo will not provide a graphical dialog.