Discussion
Pre-emptive scheduling is the strategy of temporarily suspending a gunning process
Answer: A
Pre-emptive scheduling suspends a running process before the CPU time slice expires.
In pre-emptive scheduling the operating system can take the CPU from a process that is still running, for example because a higher priority process has arrived, without waiting for the process to finish its quantum or give up the CPU. Allowing starving processes to run (B) is an aim of aging, suspension on an I/O request (C) happens in non-pre-emptive systems too, and avoiding collision (D) is not a scheduling concept.
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