For a photochemical dimerisation of a substance a, the following rate law is obtained.
`(d[A_(2)])/(dt)=(k_(1)k_(3)I[A])/(k_(2)+k_(4)[A])`
If it is known us obeying zero order kinetics then what will be the value of rate of appearance of the dimer?
A. I
B. `k_(1)k_(3)I`
C. `(k_(1)k_(3)I)/(k_(4))`
D. `(k_(1)k_(3))/(k_(4))`