19. Given the reference string of page accesses: 1 2 3 4 2 3 4 1 2 1 1 3 1 4 and a system with
three page frames, what is the final configuration of the three frames after the LRU
algorithm is applied? Assume the FIFO queue is left out right in.
(A)1,3,4
(B) 3, 1.4
(C)4,1,2
(D)1,2,3
(E) 1,4,3