-9. Define page table and page frame. Then consider the following. A system receives a series of page references in the following order: 1, 1,3, 5, 2, 2, 6, 8, 7, 6, 2, 1, 5,5, 5, 1, 4, 9, 7, and 7. The system has five page frames. If all of the frames are initially empty calculate the number of page faults using the LRU, FIFO, and Optimal page replacement algorithms