If $A$ is any matrix, then the product $A A$ is defined only when A is a matrix of order $m \times n$ where :

m > n

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m < n

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m = n

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m \leq n

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Solution

The correct option is D $m = n$
Let two matrix be $A$ and $B$ of order $m \times n$ and $l \times k$ respectively.
They can be multiplied if $n = l$
So, if a matrix $A$ of order $m \times n$ is to be multiplied by $A$
Then, $m = n$

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