##### Lecture on Eigen Vectors
Content covered:

Which one of the following is an eigen vector of the matrix $\begin{bmatrix} 5 & 0 & 0 & 0\\ 0 & 5 & 5 & 0\\ 0 & 0 & 2 & 1\\ 0 & 0 & 3 & 1\end{bmatrix}$ ?

(a) $\begin{bmatrix} 1\\ -2\\0\\0 \end{bmatrix}$                                    (b)    $\begin{bmatrix} 0\\ 0\\1\\0 \end{bmatrix}$

(c)    $\begin{bmatrix} 1\\0 \\0\\-2 \end{bmatrix}$                                  (d)    $\begin{bmatrix} 1\\ 0\\1\\0 \end{bmatrix}$