【单选题】【消耗次数：1】
在页式虚存系统中，把以后不再访问的或距当前最长时间后再访问的那一页调出的页面调度算法是（）
①
最佳调度算法(OPT)\
②
最近最久未使用调度算法(LRU)
③
最近最不经常使用调度算法(LFU)
④
先进先出调度算法(FIFO)
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