In an informal letter, where is a ‘P.S.’ (postscript) written?

The correct answer is Option (4) → Below the writer’s name, at the very end of the letter

P.S. stands for postscript, which means “written after”. The writer adds this short note after the letter is finished and signed. So it comes below the writer’s name, at the very end.

Why the Other Options are Incorrect?

Option 1: Above the sender’s address, at the top of the page — Incorrect. A postscript is added after the letter is over, so it cannot be at the top.

Option 2: Between the sender’s address and the date — Incorrect. Nothing is written between these two parts. The date comes right below the address.

Option 3: As the last paragraph of the body — Incorrect. A postscript is not part of the body. It is added only after the writer has signed off.