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If \( \mathrm{A} \) is matrix of order \( m \times n \) and \( \mathrm{B} \) is a matrix such that \( \mathrm{AB}^{\prime} \) and \( \mathrm{B}^{\prime} \mathrm{A} \) are both defined, then order of matrix \( B \) is
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(A) \( m \times m \)
(B) \( n \times n \)
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(C) \( n \times m \)
(D) \( m \times n \)
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