** Question 4 needs MULTIPLE ANSWERS. Thank you :)

Question 4 7.14 pts Which of the following statements are advantages offered by virtual memory? allows system libraries to be shared among many processes frees programmers from worrying about physical memory sparse virtual address s space tfor proceSSes D fork0 can be improved by having the child process initially share the memory of its parent Question 5 7.14 pts Calculate the page fault rate on a memory with 4 page frames for the Optimal page replacement algorithm for the following sequence of page references: 1.2.34,5.13,714,5.2.3,76.25.1. Enter only the percent number. For instance if the result is 55.55%, enter only 55.55. Question 6 7.14 pts The pager in demand paging does.. swaps in a page that is marked as valid in its page table entry allocates physical memory for page Lables O swaps in and out entire processes O swaps pages in and out, as needed