Final answer:
The correct answer is Extranet. An extranet is a private network that allows external entities to access certain parts of a company's internal network in a secure manner.
Step-by-step explanation:
The correct answer is b) Extranet. An extranet is a telecommunications network that allows external entities, such as customers, suppliers, or partners, to securely access certain parts of a company's internal network. It is a private network that is accessible to authorized external users, and it can include public networks that are shared with other users.