Doubt -OS process scheduling

Question

If arrival time of a process is same as the end time of quantum slice for a process in round robin schedule then in what order we must place the processes in ready queue?

Comments

Please, give any example.

---

Arriving process is placed first. Then after the process whose time slice has expired.

---

Assume 4 processes A B C D with burst time 2 msec and  time quantum 2 msec
So process A will arrive at the completion of fisrt time quantum
so it's arrival time is 2 now A got cpu and again after 2 msec time quantum expires so process B will arrive at 4msec , similarly for other processes.
So arrival order will be first come first serve .