Demand paging problems (page replacement algorithms): 1. For the following reference string apply the FIFO page replacement algorithm. Reference string175401 4 73 6504 7321 Physical frame 0 Physical frame 1 Physical frame 2 Physical frame 3 Page faults Victim frames 2. For the following reference string apply the OPT page replacement algorithm Reference string175401 4 73 6504 7321 Physical frame0 Physical frame1 Physical frame 2 Physical frame3 Page faults Victim frames 3. For the following reference string apply the LRU page replacement algorithm. Reference string175401 4 73 6504 7321 Physical frame0 Physical frame1 Physical frame 2 Physical frame3 Page faults Victim frames 4. For the following reference string apply the LFU page replacement algorithm. Reference string175401 4 73 6504 7321 Physical frame 0 Physical frame1 Physical frame 2 Physical frame 3 Page faults Victim frames