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Linear Algebra

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Which One is Skew-Symmeric?

LINALG-ERELX5

Which of the following matrices is skew-symmetric?

A

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

B

$\begin{pmatrix}1&1&1\\\ 0&0&0\\\ -1&-1&-1\end{pmatrix}$

C

$\begin{pmatrix}0&1&-1\\\ -1&0&0\\\ 1&0&0\end{pmatrix}$

D

$\begin{pmatrix}1&2&2\\\ 2&0&1\\\ 2&1&0\end{pmatrix}$

E

$\begin{pmatrix}0&1&1\\\ -1&2&1\\\ -1&-1&0\end{pmatrix}$