Nonpreemptive Scheduling
A scheduling discipline is nonpreemptive if, once a process has been given the CPU, the CPU cannot be taken away from that process.
Eg: FIFO→ Non preemptive
Preemptive Scheduling
A scheduling discipline is preemptive if, once a process has been given the CPU can taken away.
Eg: Round robin is non preemptive
Multilevel queue scheduling is preemptive
Answer-A.1