PARTI: Given the following memory reference string for a particular process 7,0,1,2,0,3,0,4,2,3,0,3,0,3,2,1,2,0,1,7,0,1 Considering that the process has 4 frames in the main memory, calculate the following: 1- Number of Page faults when using LRU page replacement 2- Number of Page hits when using LRU page replacement 3- Number of Page faults when using FIFO page replacement 4- Page hits rate using FIFO page replacement 5- Number of Page faults when using Optimal Page replacement