(T6)ChooSE all the correct answers

Question 1 Which of the following are true about paged virtual memory, and segmented virtual memory? Not yet answered Select one or more: Marked out of a. 1.00 For a system using segmented virtual memory, the best-fit placement algorithm is usually more computationally expensive than the first-fit or next-fit placement algorithms. P Flag question b. The "Optimal" page replacement algorithm for paged virtual memory can be used as a theoretical benchmark for the performance of other page replacement algorithms, in terms of the number of page faults. c. For segmented virtual memory, a logical address is valid if it consists of a valid segment number and an offset value which is not greater than the size of that segment Od. A process that experiences a page fault when requesting for a valid page will be immediately terminated by the operating system. e. For paged virtual memory, multiple pages from the same process can be placed into the same frame to reduce the wastage of unused space in a particular frame. Question 2 Which of the following are true regarding the use of virtual memory? Not yet answered Select one or more: Marked out of 1.00 a. The use of virtual memory allows one or more processes to utilise more memory than what is physically installed on the system. P Flag question b. The use of virtual memory allows programs at a certain location in main memory to be swapped to secondary storage and then back into a different location in main memory, without problems. C. Virtual memory allows more efficient utilisation of main memory by allowing the same copy of a program's instructions to be shared among multiple processes running that same program. Od. If the same physical memory address needs to be allocated to more than one process, the same virtual memory address must always be allocated to all of these processes. e. When a process requests for data at a particular virtual memory address, the system will need to first translate the virtual memory address into its corresponding physical memory address before the requested data can be provided to that process. f. A system that is experiencing "thrashing" means that the time it spends executing meaningful instructions is greater than the time it spends swapping data between main memory and secondary storage