Fill in the Blanks Below with the Part on the Operating

Short Answer

Fill in the blanks below with the part on the operating system (file manager,memory manager,device drivers,window manager,scheduler,dispatcher)that performs the activity described.
A. _______________ Maintains a record of what is displayed on the computer's screen
B. _______________ Performs the switching from one process to another
C. _______________ Maintains the directory system
D. _______________ Creates virtual memory