The Most Accurate Description of a Firewall Would Be

Multiple Choice

The most accurate description of a firewall would be:

A) a security company hired to monitor your website.
B) a hardware device used to monitor traffic between a network and the internet.
C) a software application that determines how often backups should be made and ensures that they are stored offsite.
D) a protective barrier in the wall outside of the network room.
E) a high risk area of a network.