Correct Option (b):
A Virtual Private Network (VPN) establishes a secure and encrypted connection across a public network, such as the internet. It enables users to remotely access their organization's private network while ensuring the security and privacy of the information transmitted. This is achieved through tunneling protocols and encryption, which create a virtual, private pathway over the public infrastructure.
Incorrect Options:
Option (a): This statement describes a private computer network where remote users can transmit encrypted information. However, it does not explicitly mention the crucial aspect of a VPN, which is creating a secure connection over a public network to access a private network. It primarily focuses on internal organizational transmission rather than secure extension over an external, public medium.
Option (c): This option describes a model of cloud computing, where users access a shared pool of computing resources provided by a service provider. This concept, often associated with Infrastructure as a Service (IaaS) or Platform as a Service (PaaS), is distinct from a Virtual Private Network, whose primary function is to secure remote access to a private network over a public one.
Option (d): As option (b) provides an accurate description of a Virtual Private Network, this option is incorrect.