Consider a reference string 1,2,3,2,1,5,2,1,6,2,5,6,3,1,3,6,1,2,4,3 of frame size 3. Calculate the number of page faults using optimal page replacement algorithm.

Consider a reference string 1,2,3,2,1,5,2,1,6,2,5,6,3,1,3,6,1,2,4,3 of

1.	Consider a reference string 1,2,3,2,1,5,2,1,6,2,5,6,3,1,3,6,1,2,4,3 of frame size 3. Calculate the number of page faults using optimal page replacement algorithm.
A.	12
B.	16
C.	14
D.	15
Answer» D.