Question: When an OS uses the LRU ( least - recently - used ) page replacement algorithm, what happens to the page at the head of

When an OS uses the LRU (least-recently-used) page replacement algorithm, what happens to the page at the head of the queue when a non-resident page is referenced?
Group of answer choices
The page is removed and the reference string is updated
Nothing happens
The page is removed from the queue and from memory
The page is moved to the end of the queue

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