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4. (25 poiuts ) A computer has four page frames. The time of loading, time of last access, and the R (referenced ) and M (Modified) bits for each page are shown below (the times are in clock ticks): Page Loaded Last Reference R M 0 126 230 120 150 279 260 272 280 2 Answer and explain briefly your answer for each of the following: a) Which page will NRU replace ? b) Which page will FIFO replace? e) Which page will LRU replace? d) Which page will FIFO with second chance replace