Question 3 (15 Marks) a) Differentiate between internal and external fragmentation. [2Marks] b) Consider an operating system that uses Segmentation. Given an address [S,D], where S is the segment and D is the offset. Explain how the CPU will go about resolving an address to retrieve an instruction or data in memory. [3Marks] c) A 64 bit machine is evaluating which type of paging mechanism is appropriate for its use. Discuss two page table implementation techniques stating one disadvantage for each. [6Marks] d) Use an example to illustrate how the bankers algorithm works to ensure that a deadlock does not occur.