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Que. Consider n processes sharing the CPU in round robin fashion. Assuming that each process switch takes s seconds. What must be the quantum size q such that the overhead resulting from process switching is minimized but, at the same time each process is guaranteed to get its turn at the CPU at least every t seconds ? 
a. q ≤ (t – ns)/ (n – 1)
b. q≥(t−ns)/(n−1)
c. q ≤ (t - ns)/ (n + 1)
d. q ≥ (t - ns)/(n + 1)
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