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