A 3:2 molar mixture of N2 and CO is present in a vessel at 500 bar pressure. Due to hole in the vessel, the gas mixture leaks out. The composition of mixture effusing out initially is :
a. nN2:nCO::1:2
b. nN2:nCO::6:1
c. nCO:nN2::1:2
d. nCO:nN2::2:3