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

Hi Zerodha Team,,
I read your blog and the module 5 of option trading and found it quite impressive.

I want to carry out my first trade but i have two questions
I want to short a OTM call for this month expiry at NIFTY , and will square off it with buying it back on the expiry day.
1.)I calculated with the zerodha SPAN that showed me around 37 thousand rupees would be blocked.
suppose i carry out the trade, will my margin be credited to my account when i square -off my write option with BUY , if yes , then when?
2.) instead of going with this method ,how can i go for covered call, i am to understand the covered call with stocks , but not getting it with the NIFTY index.. may you help me cos i have been stuck with the position of margins ,like what happens with the margins ..
Thanks

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