According to the Rational Root Theorem, which statement about f(x) = 12x3 – 5x2 + 6x + 9 is true?
a. Any rational root of f(x) is a multiple of 12 divided by a multiple of 9.
b. Any rational root of f(x) is a multiple of 9 divided by a multiple of 12.
c. Any rational root of f(x) is a factor of 12 divided by a factor of 9.
d. Any rational root of f(x) is a factor of 9 divided by a factor of 12.