Which type of private network allows controlled access to external users?

The correct answer is extranet, which is a type of private network designed to allow controlled access to external users, such as business partners, suppliers, or customers. This controlled access enables the sharing of information and collaboration while ensuring that sensitive internal data remains secure.

An extranet can be seen as an extension of an organization's intranet, which is typically restricted to internal users only. By providing external users with limited access to certain sections of the intranet, organizations can enhance their operational efficiency and foster better communication with key stakeholders.

Other options reflect different types of network usage. An intranet is exclusive to an organization's internal users and does not allow external access. The internet is a public network available to anyone, which doesn't fit the criteria of controlled access. A local area network (LAN) is typically confined to a specific physical location, such as an office or school, and is not inherently designed to accommodate external users.