Which of the following proxy servers is placed anonymously between the client and remote server and handles all of the traffic from the client?

A caching proxy server stores frequently requested content locally to reduce bandwidth and improve response times, but its primary function is not anonymous interception of all client traffic.

A web proxy server handles HTTP/HTTPS traffic but is typically explicitly configured on the client side, rather than being placed transparently and anonymously in the network path.

A forced proxy (also called a transparent or intercepting proxy) sits anonymously between the client and the remote server, intercepting all outbound traffic and forwarding it on behalf of the client. Unlike explicitly configured proxies, the client does not need to be aware of or configure the forced proxy - all traffic is captured and handled automatically by the proxy server.

An open proxy server is one accessible by any internet user to anonymize requests, but it is not specifically characterized by being forcibly placed between client and server to intercept all traffic without client awareness.