Explanation:

Let’s break down the options:

- Option 1: Set-off can be claimed in a suit for recovery of money.

This is true. Set-off is basically saying, “Hey, you want money from me, but actually, you owe me money too. Let’s settle the difference.”

- Option 2: The amount claimed must be an ascertained amount.

Also true. The law only lets you set off definite, quantified sums—not vague or unliquidated claims.

- Option 3: The amount claimed to be set off must be legally recoverable & not barred by limitation.

This checks out. If your counter-claim is time-barred (past the limitation period), or not legally enforceable, you can’t set it off.

- Option 4: All the above.

If you look at it, each statement by itself is correct, so this is the answer that sums it all up.

So, your answer—option 4—is absolutely correct.