Match the rate expressions in LIST-I for the decomposition of X with the corresponding profiles provided in LIST-II. X_s and k are constants having appropriate units. List-I: (I) rate = k[X]/(X_s+[X]) under all possible initial concentrations of X; (II) the same rate law where initial concentrations of X are much less than X_s; (III) the same rate law where initial concentrations of X are much higher than X_s; (IV) rate = k[X]²/(X_s+[X]) where initial concentration of X is much higher than X_s.