The correct answer is: A. Computer in network.
A workgroup is a group of computers that are connected to each other and share resources, such as files, printers, and folders. Workgroups are often used in small businesses and home offices.
Option B, individual user, is incorrect because a workgroup is a group of computers, not individual users.
Option C, connection, is incorrect because a workgroup is a group of computers that are connected to each other, not a connection between two computers.
Option D, all of the above, is incorrect because only option A is correct.