An organization plans to implement a load balancer as part of its network infrastructure to manage the increased web traffic to its services. The organization tasks a network administrator with ensuring that the load balancer is configured in line with best security practices to reduce the attack surface and secure the enterprise infrastructure. The network administrator's responsibilities include evaluating the network appliances, securing connectivity, and considering device placement. What is the MOST effective security measure in this scenario?

A$.$Implement a Web Application Firewall alongside the load balancer.

B$.$Configure the load balancer to operate in a fail$-$open mode.

C$.$Use a proxy server in combination with the load balancer.

D$.$Place the load balancer in the screened subnet.