For a complex reaction $\text{A}+\text{B}\to \text{C}+\text{D}$, the mechanism is proposed as: (1) $\text{A}+\text{B}\underset{k_{-1}}{\overset{k_1}{\rightleftharpoons }}\text{I}$ (fast equilibrium, $K=k_1/k_{-1}$), (2) $\text{I}\stackrel{k_2}{\to }\text{C}+\text{E}$ (slow), (3) $\text{E}+\text{B}\stackrel{k_3}{\to }\text{D}$ (fast). What is the rate law for the formation of $\text{D}$?

1. A.Rate = $k_{2}K[\text{A}][\text{B}]$
2. B.Rate = $k_{2}K[\text{A}][\text{B}{]}^2$
3. C.Rate = $k_1[\text{A}][\text{B}]$
4. D.Rate = $k_{2}K\frac{[\text{A}][\text{B}]}{[\text{C}]}$