Which of the following is a part of a company's network that lies in between the Internet and a private network?

A DNS caching-only server is a type of DNS server that resolves and caches query responses for clients, not a network zone or segment positioned between the internet and a private network.

A firewall is a security device that filters and controls network traffic based on defined rules, but it is not itself the network segment or zone that sits between the internet and a private network.

The Demilitarized Zone (DMZ) is a physical or logical subnetwork that sits between the untrusted internet and the trusted private internal network. It typically hosts public-facing services such as web servers and mail servers, isolating them from both external threats and the internal LAN. This architecture limits exposure of internal resources while still permitting controlled public access to hosted services.

A stub zone is a DNS zone type that contains only the resource records needed to identify the authoritative name servers for another zone, not a network architecture component.