In a small operating System with Virtual Memory System, the following page references is requested: 1,2,3,2,4,5,1,3,5,3,2,1,2,4,6,5 Using 3 frames, calculate the number of page fault that occurred, using: a. LRU Page Replacement Algorithm. b. Clock (Note that all frames are initially empty, so your first unique pages will cost one fault each).