Q1: Describe the key terminologies about the Operating system services a) Describe Operating System Structure? Support your answer by labelling the diagram? b) Describe OS layered approach and OS/2 layer structure? c) Describe Kernal and Micro-kernel System Structure? Support your answer by labelling the diagram? d) Consider three CPU-intensive processes, which require 10, 20 and 30 time units and arrive at times 0,2 and 6, respectively. How many context switches are needed if the operating system implements a shortest remaining time first scheduling algorithm? Do not count the context switches at time zero and at the end. Describe the pros and cons of a command line interface? Analyse and elaborate various scheduling technique of operating system? Give example for each