Answer:
![\left[\begin{array}{cccc}0&0&0&0\\1&1&1&1\\2&2&2&2\end{array}\right]](https://img.qammunity.org/2021/formulas/mathematics/college/fi8lcn43n8nbqxm8ppzi455xsi2z7wd0gp.png)
Explanation:
The matrix should have
- A row with four horizontal zeros
- A row with 4 horizontal ones
- A row with 4 horizontal twos
Thus, it should have the following form
![\left[\begin{array}{cccc}0&0&0&0\\1&1&1&1\\2&2&2&2\end{array}\right]](https://img.qammunity.org/2021/formulas/mathematics/college/fi8lcn43n8nbqxm8ppzi455xsi2z7wd0gp.png)
Always remember that the columns are vertical (just think about normal columns) and the rown are horizontal.
I hope that works for you!