Consider the virtual page reference string 1, 2, 3, 2, 4, 1, 3, 2, 4, 1 on a demand paged virtual memory system running on a computer system that has main memory size of 3 page frames which are initially empty. Let LRU, FIFO and OPTIMAL denote the number of page faults under the corresponding page replacement policy. Then

Consider the virtual page reference string 1, 2, 3, 2, 4, 1, 3, 2, 4

1.	Consider the virtual page reference string 1, 2, 3, 2, 4, 1, 3, 2, 4, 1 on a demand paged virtual memory system running on a computer system that has main memory size of 3 page frames which are initially empty. Let LRU, FIFO and OPTIMAL denote the number of page faults under the corresponding page replacement policy. Then
A.	OPTIMAL < LRU < FIFO
B.	OPTIMAL < FIFO < LRU
C.	OPTIMAL = LRU
D.	OPTIMAL = FIFO
Answer» C. OPTIMAL = LRU

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