L-arabinose is a naturally occurring, non-caloric sweetener that is a non-competitive inhibitor of sucrase. if l-arabinose is present, what will happen to the vmax of the reaction and km of the substrate?

a) vmax and km will both increase
b) vmax and km will both decrease
c) vmax will not change, but km will decrease
d) vmax will decrease, but km will not change
e) vmax will decrease, and km will increase