Consider a process executing on an operating system that uses demand paging. The average time for a memory access in the system is M units if the corresponding memory page is available in memory, and D units if the memory access causes a page fault. It has been experimental measured that the average time taken for a memory access in the process is X units.Which one of the following is the correct expression for the page fault rate experienced by the process?

Consider a process executing on an operating system that uses demand p

1.	Consider a process executing on an operating system that uses demand paging. The average time for a memory access in the system is M units if the corresponding memory page is available in memory, and D units if the memory access causes a page fault. It has been experimental measured that the average time taken for a memory access in the process is X units.Which one of the following is the correct expression for the page fault rate experienced by the process?
A.	(D - M) / (X - M)
B.	(X - M) / (D - M)
C.	(D - X) / (D - M)
D.	(X - M) / (D - X)
Answer» C. (D - X) / (D - M)

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