I want to know that should i sell it or let it exercise, if i have bought put @ 4 Rs. And on expiry it will be 0. 05 or 0. 00. And what will be the charges. Please reply

i want to know will i be charged for STT if i do not sell my put option which on expiry will be 0.05 or 0.00 rs. As i have purchased it @ rs 4/-