S1: The mail is first collected from different letter boxes. P: From there it is sent to the head post office. Q: It is then sorted out at the sorting office. R: The mail is again sorted out at the head office by the concerned beat postman. S: The sorted mail is sent to the zonal post office. S6: Finally it is delivered to us. The Proper sequence should be:

✅ The correct answer is option A.