The following picture visualizes action/events during a context switch between user processes Po and P1 as a result of CPU pre-emption process P operating system process P save state into PCB reload state from PCB, What are the correcet legends that should be placed in points 1, 2, 3, and 4 of that picture? A)runing, 2: ready, 3: interrupt, 4: return from interrupt (B) 1: runing, 2: ready, 3: switch to kernel mode, 4: switch to user mode (C) 1: ready, 2: waiting, 3: switch to kernel mode,4: switch to user mode (D) ready, 2: waiting, 3: switch to kernel mode, 4: return from interrupt (E) 1: ready, 2: waiting, 3: interrupt, 4: return from interrupt