Process P1 is running on a system with a single CPU core and invokes the sched_yield() system call, which causes the process to voluntarily relinquish its CPU time. The scheduler decides to run P1 immediately again P1 and P1 continues running. We can conclude that the system: does not support multi-tasking. uses priority-based scheduling. uses preemptive scheduling. We cannot conclude any of the given choices. uses non-preemptive scheduling