💡 An intranet is a private network accessible only to an organization's own personnel. It is designed for internal communication and collaboration, ensuring that sensitive or proprietary information is kept within the company. A (An extranet): This network extends access to authorized external users, such as partners or suppliers, which does not meet the requirement of internal-only access. B (A local area network - LAN): While a LAN is typically confined to a limited geographic area (like an office building), it is a physical network infrastructure rather than a policy or design for restricting access exclusively to internal personnel. D (The internet): This is a public network accessible to anyone, which does not provide the exclusivity needed for internal communications.