For any two matrices \( \mathrm{A} \) and \( \mathrm{B} \), we have...

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For any two matrices \( \mathrm{A} \) and \( \mathrm{B} \), we have
(A) \( \mathrm{AB}=\mathrm{BA} \)
(B) \( \quad \mathrm{AB} \neq \mathrm{BA} \)
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(C) \( \mathrm{AB}=\mathrm{O} \)
(D) None of the above
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