The system unit houses the following components except?

The system unit is the main part of a desktop computer that contains all the essential components needed for the computer to work. These components include the motherboard, central processing unit (CPU), and various other storage devices like hard drives or SSDs. Out of the options listed, the component that is not housed in the system unit is the plotter. A plotter is a printing device that is used to produce high-quality graphics and drawings, typically used in engineering and architectural designs. It is a separate device that connects to the computer and is not a part of the system unit. In summary, the system unit contains important components like the motherboard and CPU, but a plotter is not housed inside the system unit.