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OPERATING SYSTEMWhat is Belady's Anomaly? Why LRU and Optimal Page Replacement algorithm doesn't suffer from this problem.20247mOPERATING SYSTEMWhich of the following page replacement algorithms suffers from Belady's anomaly? (i) Optimal replacement (ii) LRU (iii) FIFO (iv) Both (a) and (c)20232mOperating SystemIn which of the following page replacement policy Belady's anomaly occurs? (i) FIFO (ii) LRU (iii) LFU (iv) NRU20222mOPERATING SYSTEMConsider the following page reference string: 1, 2, 3, 4, 2, 1, 5, 6, 2, 1, 2, 3, 7, 6, 3, 2, 1, 2, 3, 6. Compare the page faults occur for the following replacement algorithms using 3 frames? Assume, initially all the frames are empty. (i) LRU replacement (ii) FIFO Replacement202414m