The correct answer is D. networking.
Networking is the linking of PCs with a communications system. It allows users to share files, printers, and other resources. It also allows users to communicate with each other through email, instant messaging, and video conferencing.
Workstations are personal computers that are used for specialized tasks, such as computer-aided design (CAD) or scientific computing. They are typically more powerful than general-purpose PCs and are often connected to a local area network (LAN).
Streaming is the process of transferring data in a continuous stream, so that it can be played back immediately without having to be completely downloaded first. This is often used for audio and video content, such as music and movies.
Turnkey systems are complete systems that are ready to use right out of the box. They are often used for businesses that need a specific type of system, such as a point-of-sale system or a customer relationship management (CRM) system.
None of the above is not the correct answer.