(3) (a) What is Base64? Show at least one application of Base64. (b) What does mount command do in UNIX? Explain with example. [You may use Internet to complete your answers. Proper citation must be provided] (4) Our CPU is currently idle and the current time is labeled time 0. Four processes arrive to the ready queue at the following times and with the following required run time: Process Arrival Time 0 1 2 3 Run Time 9 28 D Simulate the process scheduling and execution under the FCFS, SJF, and SRT scheduling algorithms. Indicate each scheduling decision, and calculate the turnaround time for each process. Also calculate the average turnaround time for each scheduling algorithm. I have started the solution below for FCFS to give an example of the format for your answer.

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