It is a unit of disk space allocation for files and directories. Hope this helps :)
<span>Think about the things people might have wanted private, but after death they have no control.</span>
Answer: 1)System Palette
Explanation: System palette is kind of palette found in the system which contain the color values that is used by the display.This palette is also drawing of the devices and applications.But the application don't get the direct access to the system palette rather logical palette permits it.
They work on the basis of the properties carried from the Back color and Fore color.Other palettes mention in the option is incorrect because these palettes don't work for the operating system's display .Thus the correct option is option(1).