![\left[\begin{array}{cc}a_{1}&a_{2}\\a_{3}&a_{4}\end{array}\right] * \left[\begin{array}{cc}b_{1}&b_{2}\\b_{3}&b_{4}\end{array}\right] = \left[\begin{array}{cc}(a_{1} * b_{1} + a_{2}* b_{3})&(a_{1} * b_{2} + a_{2} * b_{4})\\(a_{3} * b_{1} + a_{4} * b_{3})&(a_{3} * b_{2} + a_{4} * b_{4})\end{array}\right]](/tpl/images/0568/8489/3a255.png)
The answer is not B?
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