Question: Which is the correct statement? UNIX Kernel employs flag - mounting page replacement algorithms. UNIX Kernel employs least frequently used ( LFU ) page replacement

Which is the correct statement?
UNIX Kernel employs flag-mounting page replacement algorithms.
UNIX Kernel employs least frequently used (LFU) page replacement algorithms.
UNIX Kernel employs least recently used (LRU) page replacement algorithms.
UNIX Kernel employs First-In First-Out (FIFO) page replacement algorithms.

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