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. _______________ Executes each time a time slice terminates
B. _______________ Removes entries from the process table
C. _______________ Maintains a record of available mass storage space
D. _______________ Displays icons on the computer screen