Study the following UNIX filesystem tree carefully and answer questions a- d: bin myfirst report lib david usr daniel dev gabriel a. Given that your present working directory (pwd) is usr, write down the absolute and relative pathnames for the files myfirst and report. b. With usr as your pwd, write down the command to change your pwd to gabriel c. With gabriel as your pwd, change your pwd to / d. with / as your pwd, using the vi editor, create a file called exam.doc in each subdirectory in the usr directory using sudo 2. With the help of a diagram, briefly explain each of the four fundamental functions of a computer system 3. The steps required to process each instruction can be grouped into two phases: the instruction cycle and the execution cycle. Outline the sequence of events in each operation. 4. With the help of a diagram, explain the UNIX system components.