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  4. The set M =[1 0 0 1],[1 0 0 -1],[-1 0 0 1],[-1 0 0 -1] under matrix multiplication is

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Q. The set $M =\begin{bmatrix}1 & 0 \\ 0 & 1\end{bmatrix},\begin{bmatrix}1 & 0 \\ 0 & -1\end{bmatrix},\begin{bmatrix}-1 & 0 \\ 0 & 1\end{bmatrix},\begin{bmatrix}-1 & 0 \\ 0 & -1\end{bmatrix}$ under matrix multiplication is

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Solution:

Correct answer is (b) a commutative group