Which is the best ea used for options trading? on which chart it has to be applied? which is the best time frame to be selected?

Algos, strategies, code
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you can try with https://zerodha.com/expert-advisors/  and candle stick charts  with 3 or 5 minutes time frame would be best according to me.

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@AlgoGeek, Yeah any particular or specific EA you would recommend for NIFTY Index Options Trading