Which of the following servers provides encrypted tunnel SOCKS services?

SNMP (Simple Network Management Protocol) is used for collecting and organizing information about managed devices on IP networks and for modifying that information, not for providing SOCKS proxy services.

A VPN (Virtual Private Network) provides secure, encrypted network connections, but it typically offers network-level access rather than directly providing a SOCKS proxy service, although SOCKS traffic can traverse a VPN.

A CA (Certificate Authority) is responsible for issuing and managing digital certificates used for authentication and encryption, but it does not provide proxy or tunneling services itself.

SSH (Secure Shell) servers can provide encrypted SOCKS proxy services through dynamic port forwarding, typically using the `ssh -D` command, which establishes an encrypted tunnel for SOCKS traffic.