Consider the following reference string:
7, 0, 1, 2, 0, 3, 0, 4, 2, 3, 0, 3, 2, 1, 2, 0, 1, 7, 0, 1
Find the number of Page Faults with FIFO, Optimal Page
Replacement, and LRU with four free frames that are initially
empty. Which algorithm gives the minimum number of page faults?