Which of the answers describes what a VPN is$?$

A Virtual Private Network $($VPN$)$ is the term used to carve up a network into multiple VLANs.

A Virtual Private Network $($VPN$)$ is the location on the network where software$-$based $($virtualized$)$ routers are located.

A Virtual Private Network $($VPN$)$ is the location on the network where software$-$based $($virtualized$)$ firewalls are located.

A Virtual Private Network $($VPN$)$ is a remote access connection that uses encryption to securely send data over an untrusted network.