Question: (15). can acquire the minimum average time for a given set of processes A. FCFS (First-Come First-Serve) B. SJF (Shortest Job First) C. RR (Round-Robin)

(15). can acquire the minimum average time for a given set of processes A. FCFS (First-Come First-Serve) B. SJF (Shortest Job First) C. RR (Round-Robin) D. Multi-Level Queue 2 / 4 2. Description and explanation for the following questions (30) Score (1). What is an operating system? What are the functions of the operating system? (List at least 4 functions of the operating system.) (6) (2). What is a program? What is a process? What is a thread? Explain the differences/similarities in details between them. (6) (3). What is a process control block (PCB)? Explain it in details. Use your familiar computer language to define the basic structure of PCB. (6) (4). What is Context Switch? Why we need Context Switch? What do you think of Context Switch time? (6) (5). Movie Matrix Discussion: If Leo (Mr. Anderson) is living in a virtual intelligent world and everyone in the matrix is a simulator program, then explain these main characters and their representative program in Matrix? (Anderson/Smith/Oracle) (6")

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