Which of the following devices allows for multiple web servers to host the same web page and for traffic to be distributed between them according to some metric?

A proxy server forwards client requests on their behalf and can cache content, but it does not distribute traffic across multiple backend servers for redundancy.

A VPN concentrator aggregates and manages multiple VPN tunnels from remote users or sites and has no role in distributing web server traffic.

A load balancer sits in front of a server farm and routes client requests to individual backend servers using metrics such as round-robin, least connections, or resource utilization. This allows multiple web servers to serve the same content, providing fault tolerance and horizontal scalability. The client interacts with a single virtual IP address while the load balancer transparently manages distribution to the real servers.

A content filter inspects and controls traffic based on policy rules (such as blocking certain websites) and does not distribute traffic across servers.