The length of a cube is $ 2.1 \times 10^{-2}\;m$ . The volume in significant figures will be

Question

$\begin{array}{1 1} 9.2 \times 10^{-4} \;m^{2} \\ 9.3 \times 10^{-4} \;m^3 \\ 9.26 \times 10^{-6} \;m^2 \\9.261 \times 10^{-6} \;m^2 \end{array} $