Explain page-replacement algorithms, Operating System

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Q. Consider the following page-replacement algorithms. Rank the algorithms on a five-point scale from "bad" to "perfect" according to their page-fault rate. Detach those algorithms that suffer from Belady's anomaly from those that don't.

1 FIFO replacement

2 Optimal replacements

3 LRU replacements

4 Second-chance replacement

Answer:

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