4. [40] Using the following simple network design diagram, answer the following: A. Write a paragraph describing why the network designer used two firewalls (your answer should be detailed and specific)? O B. Based on what you learned so far in the course, state the things that you may do to improve the design from the security perspective (be clear and specific)? Internet Router Switch um Web server Firewall DMZ HI Email server Switch III. Firewall Database server J Application server