Two nuclei, P and Q, have the same mass number A. The experimental mass of nucleus P is smaller than that of nucleus Q. Which statement is correct?
a) P has a smaller mass defect but a higher binding energy than Q.
b) P and Q have identical binding energies because their mass numbers are equal.
c) P has a larger mass defect and therefore a higher binding energy than Q.
d) P has a smaller binding energy because its experimental mass is smaller.