The correct answer is D. Mother board.
A motherboard is the main circuit board in a computer. It is a large, flat piece of plastic or metal that contains the central processing unit (CPU), memory, and other important components. The motherboard connects all of the other components in the computer together and allows them to communicate with each other.
A decoder is a device that converts one form of data into another. For example, a digital-to-analog converter (DAC) is a decoder that converts digital signals into analog signals.
A highlight is a feature that makes something stand out from the rest. For example, a text highlighter is a tool that can be used to make text stand out in a document.
A select is a command that allows you to choose from a list of options. For example, in a menu, you can select an item by clicking on it.