The correct option is (b) - "It is a computer network across a public internet that provides users access to their organization’s network while maintaining the security of the information transmitted."

A Virtual Private Network (VPN) is a network that enables remote users to securely connect to a private network over the internet. It creates a secure and encrypted connection between the user`s device and the organization`s network, allowing remote users to access the resources and services on the organization`s network as if they were physically present in the same location as the network. VPNs are commonly used by organizations to provide secure remote access to their employees or to connect geographically dispersed offices or data centers.