What is "Virtual Private Network"?

• A. It is a private computer network of an organization where the remote users can transmit encrypted information through the server of the organization
• 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
• C. It is a computer network in which users can access a shared pool of computing resources through a service provider
• D. None of the statements (a), (b) and (c) given above is a correct description of Virtual Private Network