(a) Explain the difference between a job and a process. (b) Explain the difference between a foreground process and a background process. (c) Explain the difference between a centralized version control system and a distributed version control system. (d) Clearly explain the steps you need to take to suspend a job that was started from your shell and then resume it. (e) Clearly explain how to start a program from your shell as a background process (without starting it as a foreground process first). (f) Clearly explain how to switch a foreground process to the background from your shell