Identify the circumstances under which pre-emptive CPU scheduling is used:

(a) A process switches from Running state to Ready state

(b) A process switches from Waiting state to Ready state

(c) A process completes its execution

(d) A process switches from Ready to Waiting state

Choose the correct option:

1
(a) and (b) only
2
(a) and (d) only
3
(c) and (d) only
4
(a), (b), (c) only

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