Final answer:
Extranets are private networks that securely share business information or operations with authorized external users, under controlled access, rather than being limited to a single organization or providing public access to confidential information.
Step-by-step explanation:
Which statement is true of extranets? The correct answer is that extranets allow controlled access to authorized external users. An extranet is a private network that uses internet protocols, network connectivity, and possibly the public telecommunication system to securely share part of a business's information or operations with suppliers, vendors, partners, customers, or other businesses. It is not limited to a single organization's internal use; this would describe an intranet. Extranets do not provide public access to confidential information; instead, they ensure that such information is available to authorized external parties. Extranets can connect to an organization's intranet but also include controlled access points for external users, thereby extending the reach of the intranet's services and information.