Working and Structure of Nifty 50 ETF (Nifty Bees)

Hi,

  1. Can someone explain how outstanding shares are created in an ETF nike Nifty BEES?
  2. Is there any upper limit to purchase of Nifty BEES?
  3. How is the NAV of a NIFTYBEE calculated?
  4. How does expense ratio affect my costs/holding? How is it calculated?
    Can one expect tracking error to be very marginal?

Thanks