Which of the following is the purpose of the virtual memory system that is known as
one of the functions provided by an OS?
a) To prevent an application program from accessing the protected area on main
memory used by the OS
b) To reduce electricity consumption during the idle state, by stopping the power
supply after data is written from main memory to external storage
c) To make it possible to execute a program even if the program requires more storage
capacity than main memory
d) To accelerate CPU processing with the assistance of a higher speed storage device
than main memory