For the following liquid phase elementary reactions:

$3A+BD,-r_{B1}=0\mathrm{.}1C_A^3{C}_B$

$A+2B2U-r_{A2}=0\mathrm{.}1C_A{C}_B^2$

Decide on the type of reactors' configurations you would choose to enhance the instantaneous selectivity $S_{\frac{D}{U}}.$ Choose $3$ configurations.