Applying the LRU page replacement to the following reference string : 1 2 4 5 2 1 2 4 The main memory can accommodate 3 pages and it already has pages 1 and 2. Page 1 came in before page 2. How many page faults will occur ?

Applying the LRU page replacement to the following reference string :

1.	Applying the LRU page replacement to the following reference string : 1 2 4 5 2 1 2 4 The main memory can accommodate 3 pages and it already has pages 1 and 2. Page 1 came in before page 2. How many page faults will occur ?
A.	2
B.	3
C.	4
D.	5
Answer» D. 5