In which one of the following page replacement algorithms

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In which one of the following page replacement algorithms it is possible for the page fault rate to increase even when the number of allocated frames increases?

1. LRU (Least Recently Used)
2. OPT (Optimal Page Replacement)
3. MRU (Most Recently Used)
4. FIFO (First In First Out)

Correct Option: D

When the rate of page fault increases even after the increasing number of allocated frames, then this situation is called “Belady’s Anamoly”. In the given options, it’s occurring in FIFO only.

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