WILL MARK BRAINIST FOR THE CORRECT ANSWER Let f(x) = 9x3 + 21x2 − 14 and g(x) = 3x + 1. Find f of x over g of x.

a) 3 times x squared plus 6 times x minus 2 minus 12 over the quantity 3 times x plus 1
b) 3 times x squared plus 6 times x minus 2 plus 12 over the quantity 3 times x plus 1
c) 3 times x squared plus 6 times x plus 2 minus 12 over the quantity 3 times x plus 1
d) 3 times x squared plus 6 times x plus 2 plus 12 over the quantity 3 times x plus 1