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1. What are the three major activities of an operating system inregard to secondary-storage management?2. What are the five major activities of an operating system inregard to file management?3. What is the purpose of the command interpreter? Why is itusually separate from the kernel?4. List five services provided by an operating system. Explain howeach provides convenience to the users. Explain also in which casesit would be impossible for user-level programs to provide theseservices.5. What is the purpose of system calls?6. What is the purpose of system programs?