In the following process state transition diagram for a

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In the following process state transition diagram for a uniprocessor system, assume that there are always some processes in the ready state.

Now consider the following statements:
1. If a process makes a transition D, it would result in another process making transition A immediately.
2. A process P₂ is blocked state can make transition E while another process P₁ is in running state.
3. The operating system uses pre-emptive scheduling.
4. The operating system uses non-pre-emptive scheduling. Which of the above statements are true?

1. 1 and 2
2. 1 and 3
3. 2 and 3
4. 2 and 4

Correct Option: C

1. is false. If a process makes a transition D, it would result in another process making transition B, not A. 2. is true. A process can move to ready state when I/O completes irrespective of other process being in running state or not.
3. is true because there is a transition from running to ready state.
4. is false as the OS uses preemptive scheduling