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Group B: Firewalls are not needed, its much better to just shut down all the ports that are in state 'LISTEN' and to make sure that user permissions are setup in a way that noone can install anything on the system. Keep the system clean, shut down all non needed services, and make sure that you never download anything which you are not 100000% sure of what it is.... Make sure that no hidden background application can be triggered in opening a port upon a certain TCP protocol, and make sure to have an uptodate AV. Make sure that you get a password prompt every 20 seconds to annoy you. Etc.....
Ports?? 'LISTEN'? permissions? services? background application? opening a port? TCP protocol????