$\dfrac{1}{9}$ expressed as an exponent of $\dfrac{1}{3}$ is —

Question

Accepted Answer

$\left(\dfrac{1}{3}\right)^2$

Answer

$\left(\dfrac{1}{3}\right)^3$

Answer

$\left(\dfrac{1}{3}\right)^{-2}$

Answer

$\left(\dfrac{1}{3}\right)^{1/2}$

19\dfrac{1}{9}91​ expressed as an exponent of 13\dfrac{1}{3}31​ is —