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Which of the following matrices are one-to-one?

Select ALL that apply.

$\begin{pmatrix}1&2&3\\\ 4&5&6\end{pmatrix}$

$\begin{pmatrix}1&2&3\\\ 4&5&6\\\ 7&8&9\end{pmatrix}$

$\begin{pmatrix}1&2\\\ 3&4\\\ 5&6\end{pmatrix}$

$\begin{pmatrix}1&2&3\\\ 4&5&4\\\ 3&2&1\end{pmatrix}$

$\begin{pmatrix}1&1\\\ 1&1\\\ 1&1\end{pmatrix}$