Comment on STT Trap - Options Expiry - NSE BSE MCX-SX

Hi,

Have a doubt on the settlement price considered at the time of option expiry ?
Is it the last traded price or the closing price which is calculated as avg of the last half an hour before closing.
E.g. Axis bank Last traded price as on 29Sep (Expiry) is 541 but Closing Price is shown as 539.30.
I had sold a Put with 540 as strike. So at expiry, is the option in the money or out of the money.

Thanks

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