40. Which statement is correct about the Michaelis-Menten constant, , for the kinetic mechanism below?(A) It is numerically equal to the substrate concentration required to achieve one half the maximum velocity, (B) It's defined as ,(C) It is approximately equal to the dissociation constant for the enzyme-substrate complex to E + P, (D) The value of is constant for an enzyme regardless of the specific substrate molecule used to determine it, (E) Its numeric value has the units of .