What can be used as servers and do not require special installation?

Workstations can serve as basic servers in small networks. While they are typically used for individual tasks, they can be configured to act as servers for file sharing, printing, or hosting lightweight applications without needing specialized installation or infrastructure.

Minicomputers (B) are outdated mid-range systems.

Supercomputers (C) are specialized, high-cost systems for massive computations, not typical servers.

“None of the above” (D) is incorrect because workstations can indeed be used as servers.