9) Which of the following is true about the strategy that uses page fault frequency (PFF) to prevent thrashing?
(A) A new page is allocated to a process if PFF is too high.
(B) A page is deallocated from a process if the PFF is too low.
(C) Easier to be implemented than Working Set
(D) All of the above.

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統計： A(0), B(0), C(0), D(1), E(0) #2926615