Consider the following process arrival, CPU and I$/$O burst times, and priorities given in the table below. Consider $1$ as the highest priority.

Assume that only one I$/$O device is available and it operates in FCFS manner without context switch time.

Assume that there is only one CPU and it is scheduled using preemptive Round Robin with quantum $=3$ms with context switch $=1$ms$.$

Pid $|$ Arrival time $|$ CPU burst time $|$ I$/$o burst time $|$ CPU burst time $|$ Priority

A $|0|5|-|-|2$

B $|4|7|4|2|2$

C $|8|10|5||1$

D $|6|6|-|-|2$

Draw CPU and I$/$O Gantt Chart, and then find Average waiting time, and average response time, and turn around time and cpu utilization.