If the pH at one-half the first and second equivalence points of a dibasic acid is 4.80 and 7.24, respectively, what are the values for pKₐ₁ and pKₐ₂?
a) 3.80, 6.24
b) 4.80, 7.24
c) 5.80, 8.24
d) 6.80, 9.24