**each row**and

**each column**is $k$. Which of the following must be an eigenvector of $A$?

- $\left[\begin{array}{c}

1\\ 0\end{array}\right]$ - $\left[\begin{array}{c}

0\\ 1\end{array}\right]$ - $\left[\begin{array}{c}

1\\ 1\end{array}\right]$

- 1 only
- 2 only
- 3 only
- 1 and 2
- 1, 2, and 3

Solution :

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