Choose the item which best describes the nonpreemptive scheduling approach. 1. A user process in the running state can only change state to the termination state.
2. Once a user process gets the CPU, it never relinquishes it for any reason.
3. Once a user process gets the CPU, it keeps running until either it terminates, or it issues a blocking I/O request, or it has to wait for a child process to terminate.
4. When a user process enters the ready queue, it is switched into the running state regardless of whether or not another user process is currently running on the CPU.