Match the rate expressions in LIST-I for the decomposition of X with the corresponding profiles provided in LIST-II. Xs and k are constants having appropriate units.
 

	LIST-I		LIST-II
I)	$\text{ rate }=\frac{\mathrm{k}\left[\mathrm{X}\right]}{{\mathrm{X}}_{\mathrm{s}}+\left[\mathrm{X}\right]}$ under all possible initial concentrations of X	P
II)	$\text{ rate }=\frac{\mathrm{k}\left[\mathrm{X}\right]}{{\mathrm{X}}_{\mathrm{s}}+\left[\mathrm{X}\right]}$ where initial concentrations of X are much less than Xs	Q
III)	$\text{ rate }=\frac{\mathrm{k}\left[\mathrm{X}\right]}{{\mathrm{X}}_{\mathrm{s}}+\left[\mathrm{X}\right]}$ where initial concentrations of X are much higher than Xs	R
IV)	$\text{ rate }=\frac{\mathrm{k}[\mathrm{X}{]}^2}{{\mathrm{X}}_{\mathrm{s}}+\left[\mathrm{X}\right]}$ where initial concentration of X is much higher than Xs	S
		T

Choose the correct answer:

	A	B	C	D
I	P	Q	S	T
II	R	S	S	T
III	P	Q	Q	R
IV	R	S	Q	R