The individual mass transfer co$-$efficients $($moles$/$m$2$s$)$ for absorption of a solute from a gas mixture into a liquid solvent are, KL $=4\mathrm{.}5$ and KG $=1\mathrm{.}5.$ The slope of the equilibrium line is $3.$ Which of the following resistance $($s$)$ is $($are$)$ controlling?

Liquid side

Gas side

Interfacial

Both liquid and gas side