Problem $3.$ Scheduling Policy: $8$ points

Q$3-1.$ We have studied four scheduling policies, FIFO, LIFO, SPT$,$ and EDD. Among them, to minimize the mean flow time, which policy will be recommended? Choose one among four $($No need to explain$)$

Q$3-2.$ Among FIFO, LIFO, SPT$,$ and EDD, to minimize the number of Tardy Jobs, which policy do you think is better? Choose one among four $($No need to explain$).$