Question: Which of the following statements about virtual memory in operating systems is correct?

A) Virtual memory allows a system to use more memory than is physically available by swapping data between RAM and disk storage, but it does not affect the performance of the system.
B) The page replacement algorithm is responsible for deciding which pages to swap out of physical memory when new pages are needed, with the goal of minimizing page faults.
C) In a demand paging system, pages are loaded into memory only when they are accessed for the first time, which eliminates the need for any pre-loading of pages.
D) The size of the virtual address space is always equal to the size of the physical memory in a system, meaning that each process can access the same amount of memory as is physically installed.