Answer:
Preemptive multitasking
Step-by-step explanation:
In preemptive multitasking , the OS switches the process only if there is a high priority process waiting to execute. In contrast, in non-preemptive multitasking, the OS may pause the process for a longer period because there are no processes that can run. Some OS such as Mac OS X and Windows NT uses both preemptive and non-preemptive multitasking.