The rank of the matrix $\begin{bmatrix} 1 & -1 & 2 \\2 & -2 & 4 \\4 & -4 & 8 \end{bmatrix}$ is

Question

\[\begin{array}{1 1}(1)1 & (2)2 \\ (3)3 & (4)4\end{array}\]