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# The matrix $P=\begin{bmatrix}0 & 0 & 4\\0 & 4 & 0\\4 & 0 & 0\end{bmatrix}$ is a

$\begin{array}{1 1}(A)\quad square\;matrix & (B)\quad diagonal\;matrix\\(C)\quad unit\;matrix & (D)\quad none\end{array}.$

Toolbox:
• A matrix in which the number of rows are equal to the number of columns is said to be square matrix.
Given
P=$\begin{bmatrix}0 & 0 &4\\0 & 4 & 0\\4 & 0 & 0\end{bmatrix}$
The matrix P=$\begin{bmatrix}0 & 0 &4\\0 & 4 & 0\\4 & 0 & 0\end{bmatrix}$ is a (A) square matrix.
Reason:
A matrix in which the number of rows are equal to the number of columns is said to be square matrix.