If \( A \) is a \( 3 \times 4 \) matrix and \( B \) is a matrix such that \( A^{I} B \) and \( B...

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If \( A \) is a \( 3 \times 4 \) matrix and \( B \) is a matrix such that \( A^{I} B \) and \( B A^{T} \) are both defined, then order of \( B \) is
(A) \( 3 \times 4 \)
(B) \( 3 \times 3 \)
(C) \( 4 \times 4 \)
(D) \( 4 \times 3 \)
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