Final answer:
The true statement about an intranet is that it is a private network accessible only to authorized users, facilitating secure communication and collaboration within an organization.
Step-by-step explanation:
Among the given options, the correct statement about an intranet is: 1) It is a private network that is only accessible to authorized users. An intranet is designed to be a restricted network, enabling communication, collaboration, and information sharing within an organization or a specific group of users.
It contrasts with the broader and public network known as the Internet, which is accessible to anyone. While an intranet can indeed be used for file sharing, its defining characteristic is its privacy and limited access, not just its functionality.