Final answer:
A load balancer is a technology that helps scale applications and ensure high availability by distributing incoming network traffic across multiple servers.
Step-by-step explanation:
The correct answer is B. Load Balancer.
A load balancer is a technology that enables you to distribute incoming network traffic across multiple servers. It helps in scaling applications and ensuring high availability by evenly distributing workloads and preventing any single server from becoming overloaded. Load balancers monitor the health of servers and intelligently route traffic only to healthy servers.
For example, if a website experiences a surge in traffic, a load balancer can distribute that traffic evenly among multiple servers, allowing the website to handle the increased load without any single server becoming overwhelmed.