Concept:A demilitarized zone, (DMZ) is an area in which treaties or agreements between nations, military powers, or contending groups forbid military installations, activities, or personnel.Load balancing is defined as the methodical and efficient distribution of network or application traffic across multiple servers in a server farm.Explanation:Setting up a DMZ with two firewalls has its own advantages. The biggest advantage that you can do load balancing. A topology with two firewalls also helps in protecting internal services on the LAN from denial of the service attacks on the firewalls perimeter.So, the correct answer is option 3: