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CPU as two modes privileged and non-privileged. In order to change the mode from privileged to non-privileged

a) A hardware interrupt is needed
b) A software interrupt is needed
c) Either hardware or software interrupt is needed
d) A non-privileged instruction (which does not generate an interrupt)is needed

Answer: b
Explanation: A software interrupt by some program which needs some CPU service, at that time the two modes can be interchanged.

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