Dear Raj,
You need to buy puts of 4000 strike price when trend is down by 20pts in the intervals mentioned in 1st post i.e. at 10:30-10:45Am, 12:30 PM, 3:00 PM and buy calls at 3700 if trend is up by 20pts in these intervals.
So, buy 2 or 3 puts at 4000 if trend is down and buy 1 call at...