The correct answer is: A. Unauthorized Access
A firewall is a network security device that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It is used to protect a network from unauthorized access, malicious attacks, and data breaches.
Option B is incorrect because firewalls do not protect against virus attacks. Viruses are malicious software that can infect computers and cause damage. Firewalls can help to prevent viruses from entering a network, but they cannot remove viruses that have already infected a computer.
Option C is incorrect because firewalls do not protect against data driven attacks. Data driven attacks are attacks that target data, such as credit card numbers or personal information. Firewalls can help to protect data by preventing unauthorized access to it, but they cannot protect data from being stolen once it has been accessed.
Option D is incorrect because firewalls do not protect against fire attacks. Fire attacks are attacks that use fire to damage property or cause harm to people. Firewalls are not designed to protect against fire attacks.
Option E is incorrect because firewalls do protect against unauthorized access. This is the main purpose of a firewall.