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Optimal page – replacement algorithm is difficult to implement, because ____________

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Optimal page – replacement algorithm is difficult to implement, because ____________

(a) it requires a lot of information

(b) it requires future knowledge of the reference string

(c) it is too complex

(d) it is extremely expensive

I got this question in a national level competition.

Question is from Virtual Memory in portion The Linux System of Operating System

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Correct option is (b) it requires future knowledge of the reference string

To explain: None.

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