Please answer and explain

Assume priority O is the highest, followed by priority 1, etc. Also, assume process PO arrives immediately before process P1, which arrives immediately before process P2. Assume process PO takes 100 seconds, P1 takes 25 seconds, and P2 takes 50 seconds. Using shortest job first scheduling, what are the priorities of each process? 1.PO - priority 2 P1 - priority 1 P2 - priority 0 2. PO - priority 0 P1 - priority 1 P2 - priority 2 3. PO - priority 0 P1 - priority 2 P2 - priority 1 4.PO - priority 2 P1 - priority 0 P2 - priority 1