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When using counters to implement LRU, we replace the page with the ____________

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When using counters to implement LRU, we replace the page with the ____________

(a) smallest time value

(b) largest time value

(c) greatest size

(d) none of the mentioned

I had been asked this question in homework.

This interesting question is from Virtual Memory topic in chapter The Linux System of Operating System

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Right choice is (a) smallest time value

The explanation: Whenever a reference to a page is made, the contents of the clock register are copied into the time-of-use field in the page-table entry for that page. In this way, we always have the time of the last reference to each page.

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