the VIX is UP 6% which indicates Heavy buying in OTM Calls / Puts. Since NIFTY is trading near the Support, I would only think that OTM CALLs are being Bought.
So those who want to BUY 7900/8000 Calls Can buy when NIFTY is around 7650 and Average the Calls if it goes down further. The Daily Futures Support is at 7620 and since NIFTY is trading with a Premium of 25 points, I would think that 7645/50 would be SPOT level to Watch and BUY