1.(10 pts) Operating systems can be ciassified into several types according to the architecture of sub-systems. The following figure shows the architecture of operating systems. Four dashed rectangies (marked by A, B, C, D) are located at applications layer, system services iayer, kernel layer, and hardware layer. Appications Applcations Appicallons Lystrne Oporating Systems Hardware Please answer the location of the selected sub-systens in difference types of operating systems.