Explain (i) an advantage and (ii) a disadvantage that a global page replacement algorithm has over a local page replacement algorithm. Consider a system that adjusts the degree of multiprogramming by monitoring the mean time between page faults (i.e. T_ pf) and the mean time to service a page fault (i.e. T_ fs). Describe the performance of the paging system in terms of the degree of multiprogramming when (i) T_ pf is greater than T_ fs, (ii) T_ pf is less than T_ fs and (iii) T_ pf is equal to T_ fs