Rewrite the pair of rational expressions $\frac{1}{30x}$ and $\frac{1}{20x^2}$ so both have the LCD $60x^2$.

$\frac{2}{60x^2}$ and $\frac{3x}{60x^2}$

$\frac{x}{60x^2}$ and $\frac{1}{60x^2}$

$\frac{2x}{60x^2}$ and $\frac{3}{60x^2}$

$\frac{4}{60x^2}$ and $\frac{6}{60x^2}$