Mark is solving the equation 4x^2 = 12x - 9 using the quadratic formula.
Which values could he use for a, b and c?

A. a = 4, b = 9, c = -12

B. a = 4, b = -9, c = 12

C. a = 4, b = -12, c = 9

D. a = 4, b = 12, c = -9