Can I allow an OTM option(sold) to expire worthless?

I know i can do it in NRML mode. But suppose i have sold an OTM option on expiry day using MIS mode. And by 3:10, value of option is 0.5. So can i leave it and it will expire worthless or do i need to manually square it off to avoid rms charges.

In MIS you cannot leave your position to expire, you will have to square-off your position before cut-off time (3:25 PM), if you do not RMS will auto square-off and on this there will be charges. If you want to leave it to expire you will have to use NRML order type.

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