Right way to recite Surah Fatiha

I want to know what is the right way to recite the last verse of Surah Fatiha, is it Walaz Zauleen. or Walad Dauleen. what is the right sound one should make i have consulted many Molvi in this regard some say first method is correct and some say the second is correct i tried searching it here but didnt seem to find a relevant question.