A firm that wanted to enable its employees to use and share data without allowing outsiders to gain access could do so by establishing an intranet. The correct option is D.
An intranet is a computer network used within an organization to share information, facilitate communication, provide collaboration tools, operational systems, and other computing services, usually with no outside access.
An intranet is a network that allows employees to create content, communicate, collaborate, and grow the company culture.
Meanwhile, an extranet gives authorized customers, vendors, partners, or others outside the company controlled access.
Thus, the correct option is D.
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