According to the Rational Root Theorem, which number is a potential root of $f(x)=9 x^8+9 x^6-12 x+7$?
A2
B0
C$\frac{2}{7}$
D$\frac{7}{3}$
A2
B0
C$\frac{2}{7}$
D$\frac{7}{3}$