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When a page is selected for replacement, and its modify bit is set ____________

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When a page is selected for replacement, and its modify bit is set ____________

(a) the page is clean

(b) the page has been modified since it was read in from the disk

(c) the page is dirty

(d) the page has been modified since it was read in from the disk & page is dirty

This question was addressed to me in an interview for job.

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

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Right option is (d) the page has been modified since it was read in from the disk & page is dirty

The best I can explain: None.

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