a) Why is strict non-preemptive scheduling unlikely to be used in a computer system that provides both batch and timesharing service?

b) What is the trade-off used to select the quantum size, say, in pure Round-Robin scheduling?

c) What advantage is there in having different values of the scheduling quantum on different levels of a multilevel feedback queuing system? Your answer should consider all aspects such as fairness, starvation, efficiency, etc.