A firewall determines what external network traffic(internet) should or should not be allowed to pass internal network(computer). A firewall is network security that protects software and hardware from untrusted sites that may have viruses, worms, and bugs that are detrimental to the computer.
Cyberterrorist. They use the internet to hack into the government and private computer system which cripples the military.
Choice B, Face to face. In all the other options, an electronic device is also involved.
