Select all rational functions. There are several correct answers.

A. $h(x)=\frac{7}{3 x^2 + 6 x - 3}$

B. $a(x)=\frac{3 x^2 + 6 x - 3}{7 - 8 x^{3}}$

C. $r(x)=\frac{3 x^2 + 6 x - 3}{7 - 8 x^{-3}}$

D. $t(x)=\frac{7 - 8 x^3}{3 x^{0.7} + 6 x - 3}$

E. $n(x)=\frac{3 x^2 + 6 \sqrt{x} - 3}{7 - 8 x^{3}}$

F. $c(x)=\frac{3 x^2 + 6 x - 3}{7 + \lvert x \rvert }$

G. $b(x)=\frac{3 x^2 + 6 x - 3}{7}$

H. $m(x)=\frac{3 x + 6}{3 x +6}$

I. $s(x)=\frac{\sqrt{3} x^2 + 6 x - 3}{7 - 8 x^{3}}$

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