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ans is B 

Operating System Preemption Algorithm
Amiga OS Yes Prioritized round-robin scheduling
FreeBSD Yes Multilevel feedback queue
Linux kernel before 2.6.0 Yes Multilevel feedback queue
Linux kernel 2.6.0–2.6.23 Yes O(1) scheduler
Linux kernel after 2.6.23 Yes Completely Fair Scheduler
Mac OS pre-9 None Cooperative scheduler
Mac OS 9 Some Preemptive scheduler for MP tasks, and cooperative for processes and threads
Mac OS X Yes Multilevel feedback queue
NetBSD Yes Multilevel feedback queue
Solaris Yes Multilevel feedback queue
Windows 3.1x None Cooperative scheduler
Windows 9598Me Half Preemptive scheduler for 32-bit processes, and cooperative for 16-bit processes
Windows NT (including 2000, XP, Vista, 7, and Server) Yes Multilevel feedback queue

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