A- If the CPU scheduling policy is priority preemptive, draw gantt chart and calculate the average waiting time. (Higher number represents higher priority) Process Id P1 Arrival time Burst time Priority 4 2 P2 1 3 3 P3 2 1 4 P4 P5 3 5 5 2 5 B- Explain why the following statement is false:When several threads access shared information in main memory, mutual exclusion must be enforced to prevent the production of indeterminate results. C-Explain how the disabling and enabling of interrupts is useful in implementing mutual exclusion primitives on uniprocessor systems. Activate Win