Find the de-Broglie wave length associated with an electron moving with velocity $0.6 \;C$ given , rest mass of electron $= 9.1 \times 10^{-31} \;kg$

Question

$\begin{array}{1 1} 3.24 \times 10^{12} \;cm \\ 3.24 \times 10^{-12} \;cm \\ 3.24 \times 10^{12} \;m \\ 3.24 \times 10^{-12} \;m \end{array}$