Which of the following can be characterized as an extranet?

An extranet is characterized as a shared network that connects an organization's internal network with external partners, clients, or suppliers. This definition emphasizes the collaboration and access between an organization and those outside its corporate boundaries while still maintaining a level of control over the data and resources shared. The extranet allows for information exchange, communication, and collaboration on specific projects or services, making it a critical component for businesses that require interaction with external entities.

In contrast, a network designed for internal use only refers to an intranet, which is restricted to employees and not accessible to outsiders. A public Wi-Fi access point is open to anyone and does not have the controlled access of an extranet. Lastly, a completely separate network for guest users typically serves as a secure way to provide internet access without exposing the internal network, but it does not facilitate the collaboration aspect that defines an extranet. Thus, the only choice that aligns with the characteristics of an extranet is one that includes external partners in a shared network environment.