margin exposure for intraday options(s&p nifty) trading

#1
on brokers sites its not given distinctly and on customer care centers i get quite confusing answers.
so my queries are
1. it may sound silly but is there any broker providing intraday margin exposure for option buying?,as far as i know you have to pay 100% premium for option buying
2.what are margin requirement for intraday options buying and shorting for brokers like zerodha ,rk global, is there any broker providing better margin exposure?
 

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